【題目】It's impolite to keep someone________ for a long time.

A.waitB.to waitC.waitingD.have waited

【答案】C

【解析】

句意:讓人久等是不禮貌的。

考查固定用法,A. wait 動詞原形;B. to wait動詞不定式;C. waiting動詞現(xiàn)在分詞;D. have waited現(xiàn)在完成時。根據(jù)“keep sb doing sth讓某人一直做某事”,故選C。

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