Generally speaking,______ according to directions,the drug has no side-effect.A.when taking B.when taken C.when to take D.when to be taken还有原因、谢谢、

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Generally speaking,______ according to directions,the drug has no side-effect.
A.when taking B.when taken
C.when to take D.when to be taken
还有原因、谢谢、

B.
when the drug is taken

B
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