单项选择题

Contrast may make something appear more beautiful than it is when ______ alone.

A. seen
B. is seen
C. to be seen
D. having been seen

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单项选择题

They have done away with ______ Latin for university entrance at Harvard.

A. influential
B. indispensable
C. compulsory
D. essential

单项选择题

Tests have proved that caffeine affects the body by increasing the heart rate and rhythm, which ______ affects the circulatory system.

A. in turn
B. in return
C. turn back
D. as a result

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