单项选择题

They overcame all the difficulties and completed the project two months ahead of time,（）is something we had not expected.

A. which
B. it
C. that
D. what

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单项选择题
I parked my bike behind the building, but now it’s gone. It（）

A. may be stolen
B. must be stolen
C. must have been stolen
D. must have stolen
单项选择题
（32）（）

A. function
B. effect
C. fact
D. symbol
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