The study shows,since the drug's__,it has been given to.a.ap

The study shows,since the drug's__,it has been given to.a.approved b.approval
为什么选B,不能选A呢?

fping904 1年前已收到3个回答举报

xixili1984 幼苗

共回答了20个问题采纳率：100% 举报

这里since为介词,介词短语插在句中,如果看做连词,引导一个状语从句,不经常用于句中,顺便说一句,drug's在此不会是drug is,退一步讲也顶多是个drug was.

1年前

路过1949 幼苗

共回答了303个问题举报

单从词性上说，前面是名词所有格，后面必须是名词。

1年前

提醒自己幼苗

共回答了952个问题举报

因为是名词性短语，而选A就成了动词了

1年前

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