Generally speaking, according to the directions, _____ the drug has no side effe
题型：不详难度：来源：
Generally speaking, according to the directions, _____ the drug has no side effect.| A．when taken | B．when taking | C．when to take | D．when to be taken |
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答案
| A |
解析
| 在句中作时间状语，省略句，此处为被动，用过去分词。 |
举一反三
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