单项选择题

The doctor (told) him that he (should take) this medicine (one) pill at (one) time.

A. told
B. should
C. one
D. one
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单项选择题
(Leading) scientists are often the (kinds of person) who (have enjoyed) intellectual challenges (all their lives).
A. Leading
B. kinds of person
C. have enjoyed
D. all their lives
单项选择题
(As) I haven' t read the novel, I can't (tell) you (how) I think (of) it.
A. As
B. tell
C. how
D. of it
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