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

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

选项 A、told
B、should take
C、one
D、one

答案 D

解析应改为a。根据句意：“医生告诉他这种药每次吃一片”，at a time强调“一次，每次”。

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