单项选择题

The project required ten years of diligent research．

A．hardworking
B．basic
C．social
D．scientific
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单项选择题
We were all there when the accident occurred.
A. happened
B. broke
C. spread
D. appeared
单项选择题
The solid facts he provided in his speech left a deep impression on his audience.
A. strong
B. entire
C. reliable
D. hard
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