Generally speaking, according to the directions, the drug has no side effect.
A. if taking
B. if taken
C. if to take
D. if being taken
网友回答
A. if taking
(答案→)B. if taken
C. if to take
D. if being taken
解析：考查分词用法。Take与drug构成被动关系，所以使用过去分词。句意：一般说来，如果按照说明服用，这种药物是没有副作用的。