题目内容
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 |
B
解析试题分析：考查状语从句的省略。全句意思是：一般来说，药品在根据说明书服用时是没有副作用的。动词不定式一般不作时间状语，故先排除C、D两项。分词作状语，表示主动关系时用现在分词，表示被动关系时用过去分词。根据句意，应用B项，when taken="when" the drug is taken。
考点：考查状语从句的省略
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| A．what | B．which | C．that | D．how |
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