单项选择题

In the advanced course, students must take objective tests（）monthly intervals.

A. with
B. on
C. for
D. at

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

A. distinguish
B. pick
C. identify
D. recognize
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