单项选择题

Enormous sums of money have been spent on space exploration.

A. Much
B. Large
C. Small
D. Fixed
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单项选择题
Recently scientists have observed increased pollution in the water supply.
A. Late
B. Later
C. Latter
D. Lately
单项选择题
Jack said sorry to the manager for the mistakes he had made.
A. excused
B. pardoned
C. forgave
D. apologized
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