It isn't clear to the doctor ___ t...-环球网校

单选题

It isn't clear to the doctor ___ the boy in the emergency room can come to himself soon.

A

who

B

when

C

whom

D

whether

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答案

正确答案:D

解析

解析：主语从句：医生还不清楚急诊室里的男孩是否能很快苏醒。whether 是否。

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