单项选择题

The matter is not to be ______.

A. watched for
B. waited on
C. taken over
D. trifled with
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单项选择题
The American professor came to realize that he had underestimated the ______ of most of the Chinese students.
A. magnitude
B. gradient
C. potential
D. firmness
单项选择题
While doing calculation for the project, the designers ______ a new solution to a geological problem.
A. fell into
B. stumbled upon
C. set out
D. discovered
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