Generally speaking according to the directions the drug has no side effect．A. when takin

问题补充：

Generally speaking， according to the directions，the drug has no side effect．

A. when taking

B. when taken

C. when to take

D. when to be taker

答案：

A. when taking

(答案→)B. when taken

C. when to take

D. when to be taker

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