问题补充:
The poor boy could do nothing but at the corner of the street.
A. to sit
B. sitting
C. sit
D. sat
答案:
A. to sit
B. sitting
(答案→)C. sit
D. sat
解析:介词but前面有实义动词 do时,其后要跟没有 to的不定式,即直接跟动词原形。
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