B
spent some time on doing sth
其中on可以省略,后面跟ing形式
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they spent all night ( )the work .so they were very tired in the morning.
they spent all night ( )the work .so they were very tired in the morning.
A.do B.doing C.to do D.did
A.do B.doing C.to do D.did
英语人气：674 ℃时间：2019-09-29 03:55:14
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