单项选择题

He said it was impossible for ______ a mistake in a computer's calculation, so you can rely on that.

A. there being
B. there would be
C. there to be
D. there was
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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
单项选择题
They have done away with ______ Latin for university entrance at Harvard.
A. influential
B. indispensable
C. compulsory
D. essential
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