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 taken
答案:
A. when taking
(答案→)B. when taken
C. when to take
D. when to be taken
解析:状语从句的省略。补充完整是when the drug is taken according to the directions,可以省略the drug is。选B。
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