下列四组字符串中都可以用作C语言程序中的标识符的是()。
A.print _3d db8 aBc
B.I\am one_half startit 3pai
C.str_1 Cpp pow while
D.Pxq My->book line# His.age
A.I am looking for a T-shirt
B.Everything is ok
C.I like the red one
D.That’s it. Thanks
— I am very sorry. Can I get you another one?— ().
A、That’s fine.
B、I don’t forgive you.
C、No, forget about it.
D、It’s none of your business.
A.I am a little sad.
B.It doesn't matter.
C.It's been a difficult day.
一You seem a little blue today. What’s the matter?
-___________.
A.I am a little sad.
B.It doesn ’t matter.
C.It’s been a difficult day.
--I am sorry to put you to so much trouble.--______.
A.That's all right
B.All right
C.Don't mention it
D.Not next-time