眼部长扁平疣怎么治:.Generally speaking , ____according to the directions,the drug has no side effect.

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A. when taking B.when taken C.when to take D.when to be taken

此处选择B
这个空是填when taking还是when taken 要看后一个句子的主语是什么.
这里由the drug得知主语是drug,由于药只能被吃所以是taken.
若主语是人,就应该是:
.Generally speaking , when taking according to the directions,you will not suffer from side effect.

Generally speaking when taken according to the directions,the drug has no side effect. 状语从句+定语从句，原型为 Generally speaking when（the drug is）taken according to the directions,the drug has no side effect.

http://zhidao.baidu.com/q?word=Generally+speaking+according+to+the+directions%2Cthe+drug+has+no+side+effect.&ct=17&pn=0&tn=ikaslist&rn=10

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