题目内容
(请给出正确答案)
[主观题]
This experiment ought to ______ last week.A.be doneB.have been doneC.have doneD.do
This experiment ought to ______ last week.
A.be done
B.have been done
C.have done
D.do
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This experiment ought to ______ last week.
A.be done
B.have been done
C.have done
D.do
The experiment proved(to be)a success in the end.
The experiment ended in failure ______the lack of money.
A. as
B. by
C. for
D. with
A.a such
B.such one
C.one such
D.such as
Their experiment ______ much attention.
A.attached
B.attracted
C.acquired
D.awaked
A.experiment
B.research
C.examination
D.investigation