单项选择题

I came across this old book while I（）my room.

A.clean
B.will clean
C.have cleaned
D.was cleaning

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热门试题

单项选择题They all looked so happy.They（）have succeeded after so many failures.

A.must
B.would
C.should
D.could

单项选择题--（）will John get to the company？--In three hours.

A.How soon
B.How long
C.How often
D.How fast