题目内容
The old couple walked rather slowly, and could be seen, from time to time, to stop and rest, ________ out to sea.
A.to be staringB.stared
C.having staredD.staring
D
【解析】D 考察非谓语动词,stare的逻辑主语是the old couple,所以选择D,staring选择副词短语,在句中做伴随状语。
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