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-- 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:——打扰一下,我可以进来吗?——对不起,请坐在椅子上等叫你的名字。A. because因为; B. since 自从; C. until直到;根据 sorry. Please wait on your chair ___ your name is called.对不起,请坐在椅子上等直到叫你的名字;故选C
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