— Is Mr. Smith in the office?— Yes, ________ he is in charge of the office, he must be there.

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1. — Is Mr. Smith in the office?
— Yes, ________ he is in charge of the office, he must be there.

A . since B . however C . whether D . for

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外研版英语九年级上Module 7 Unit 3 Language in use同步练习