题目内容
（请给出正确答案）
______ , a car knocked him down.
A．As he walked home
B．Having walked home
C．While walking home
D．Walking home
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Mr. Hill works in a bank, and lives alone. The only family he has is in the next town: his sister lives there with her husband, and her son, Jack. Mr. Hill does not see his sister, or her family, from one year to the next, but he sends them Christmas cards, and he has not forgotten one of Jack's seventeen birthdays.
Last week Mr. Hill had quite a surprise. He drove home from the bank at the usual time, driving neither too slowly nor too fast; he parked his car where he always parked it ,out of the way of other cars, and he went inside to make his evening meal. Just then, there was a knock at the door. He opened the door, to find a policeman standing on the door-step.
"What have I done wrong？" Mr. Hill asked himself. "Have I driven on the wrong side of the road？ Has there been some trouble at the bank？ Have I forgotten to pay an important bill？"
"Hello, Uncle," said the policeman, "My name is Jack."
Mr. Hill ______.
A．works in a bank by himself
B．lives in a bank and works by himself
C．lives by himself and works in a bank
D．lives in a bank by himself
Suddenly he heard someone ______ gently on the window.
A．knock
B．knocking
C．knocked
D．to knock
A.had interrupted
B.to have interrupted
C.would have interrupted
D.to interrupt
What is the expression "knock cheaters off stride" mean？
A．To destroy cheater's plan
B．To kick cheaters out of game
C．To make cheaters exhausted
D．To help cheaters working on their plan
I heard somebody ______ at the door.
A．knocked
B．to knock
C．knock
D．knocking
What is the main purpose for holding such a special contest？
A．To encourage hackers to attack big companies.
B．To knock some unsecured websites offline.
C．To get some analysis data for preventing attacks.
D．To prove hacker"s professional skills on computer.
The main idea of the third paragraph is that______.
A．a mature torpedo is capable of producing enough electricity to knock down a man
B．the mass of the fish decides the intensity of electric power it generates
C．the strength of shock given by a young electric ray can only light the bulb of a pocket flashlight
D．to make full use of the energy produced by electric fish, suitable wires should be available
The accident was caused by ______.
A. the driver of the first car
B. the driver of the second car
C. the driver of the third car
D. both B and C
