Theoldcouplewalkedratherslowly,andcouldbeseen,fromtimet...
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問題詳情:
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
知識點:非謂語動詞
題型:選擇題
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