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问答题-乙酰胆碱的药理作用有哪些?

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Henry killed the dog. I'll askhim why _________.

A. did he do that
B. he did that
C. he did
D. he has done so

When and why he came here ________yet.A. B.C.D.

A. is not known
B. are not known
C. has not known
D. have not been

I wonder how much ________.

A. does the watch cost
B. did the watch cost
C. the watch cost
D. the watch costs

Maryis ________ someone might recognize her.

A. afraid of
B. afraid about
C. afraid that
D. afraid for