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
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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