【題目】Though it was very late, she kept ________ for her son's call.

A.waitB.waitedC.to waitD.waiting

【答案】D

【解析】

句意：雖然已經(jīng)很晚了，她還在等兒子的電話。

本題考查非謂語動詞。wait是動詞原形；waited是過去分詞或過去式；to wait是動詞不定式；waiting是動名詞或現(xiàn)在分詞。keep doing sth一直做某事，故選D。

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