-- Excuse me, may I come in? -- sorry. Please wait on your chair ___ your name is called.

A. Because B. since C. until

C 【解析】句意：——打擾一下，我可以進來嗎？——對不起，請坐在椅子上等叫你的名字。A. because因為； B. since 自從； C. until直到；根據(jù) sorry. Please wait on your chair ___ your name is called.對不起，請坐在椅子上等直到叫你的名字；故選C
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