单项选择题

He got well very quickly after his illness.

A. recovered
B. discovered
C. uncovered
D. covered
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单项选择题
Enormous sums of money have been spent on space exploration.
A. Much
B. Large
C. Small
D. Fixed
单项选择题
Recently scientists have observed increased pollution in the water supply.
A. Late
B. Later
C. Latter
D. Lately
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