Question

【題目】---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. whenB. whileC. untilD. since

Answer 1

【答案】C

【解析】

句意：—打擾一下，格林先生在他的辦公室嗎？—是的，但是他現(xiàn)在正在和一位老師談話。你最好等一下，直到他完成談話。A. when當(dāng)…時候；B. while當(dāng)...時候；C. until直到；D. since自從。根據(jù)本題語境可知，是一直等到他談話結(jié)束，故選C。