单项选择题

Plastic heart valves and other human "spare parts" have ______ possible many recent developments in surgery.

A. made it
B. been made
C. made

D. become
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单项选择题
The little man was ______ one meter fifty high.
A. almost than


B. hardly more than
C. nearly more than

D. as much as
单项选择题
Once environmental damage ______, it takes many years for the system to recover.
A. had done
B. is to do
C. does

D. is done
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