单项选择题

But for your help, I ______ my work yesterday.

A) can't finish
B) wasn't able to finish
C) couldn't finish
D) couldn't have finished
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单项选择题
All the class burst ______ laughter when they saw the funny picture.
A) in
B) at
C) on
D) into
单项选择题
Weather ______, we'll have an outing tomorrow.
A) permits
B) permitted
C) permitting
D) permit
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