=-is Mr.Smith in the office? 一Yes________he is in charge of the office,he must be there.

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问题 =-is Mr.Smith in the office?
一Yes________he is in charge of the office,he must be  there.

选项 A、since
B、however
C、whether
D、what

答案A

解析 in charge 0f意在“主管,照料”。句意为“因为他主管办公室,所以他一定在那儿”。since在这里引导原因状语从句。
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