单项选择题

It took me a whole hour to solve the problem.()

A.work at
B. work on
C. work out
D. work over

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单项选择题
In the Mesozoic period, the upward thrust of great rock masses created the Rocky Mountains and the Alps().

A.collision
B. angle
C. push
D. erosion
单项选择题
It's tough finding a job these days().

A. impossible
B. difficult
C. lucky
D. easy
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