Generally speaking, when___ according t...

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

A．taken

B．taking

C．to take

D．to be taken

A 【解析】考查分词做状语。分词做状语时，如果动词与后面的主语构成主动关系，就使用现在分词的形式，如果构成被动关系，就使用过去分词。本题的take与后面的主语the medicine构成被动关系，故使用过去分词。句意;一般后说来，根据说明服用，这些咬是没有副作用的。故A正确。

考点分析：

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