单项选择题

His health ______, my uncle had to leave the air force in 1948.

A. failed
B. was failed
C. fairing
D. had failed
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单项选择题
The old professor had such a bad memory that he looked for the watch while he is ______ .
A. having it on
B. having on it
C. wearing it
D. putting it on
单项选择题
The film had a very powerful effect ______ her.
A. on
B. at
C. with
D. for
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