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单项选择题

The professor required that all the essays（）ready by next Monday.

A. to be
B. be
C. being
D. are

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单项选择题
Colorblind people find it difficult to（）shades of colors.

A. distinguish
B. pick
C. identify
D. recognize
单项选择题
They hardly believed that the troop（）the river that night, and surrounded their city.

A. to cross
B. had crossed
C. crossing
D. cross
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