—Is MrSmith in the office?—Yes, _____he is in charge of the office, he must be there.

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问题 —Is MrSmith in the office?—Yes, _____he is in charge of the office, he must be there.

选项 A、since
B、however
C、whether
D、for

答案A

解析 since在这里引导原因状语从句
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