单项选择题

It () have been Jack who left the umbrella here as he is the only one that brought his umbrella to the classroom.

A. could
B. might
C. ought to
D. must

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单项选择题
The naughty boy had been told that whether () his ball or not was still under discussion.

A. get back
B. will get back
C. getting back
D. to get back
单项选择题
His grandfather's house in the suburbs is much larger than his, but it is twice () cheap.

A. so
B. as
C. than
D. enough
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