—Excuse me, is Mr. Green in his office? —Yes, but he's talking to a teacher. You'd better wait __________ he finishes

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1. (2022九上·期中) —Excuse me, is Mr. Green in his office?
—Yes, but he's talking to a teacher. You'd better wait __________ he finishes his talk.

A . when B . while C . until D . since

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初中英语牛津译林版九年级上册期中测试卷