Theoldcouplewalkedratherslowly,andcouldbeseen,fromtime...
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问题详情:
The old couple walked rather slowly, and could be seen, from time to time, to stop and rest, ______ out to sea.
A. to be staring B. stared C. having stared D. staring
【回答】
D
知识点:非谓语动词
题型:选择题