单项选择题

It's time to have class. We had better ______ and ______ to the teacher.

A. stop talking... listen
B. to stop talking... listen
C. stop talking... to listen
D. to stop talking... to listen
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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
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
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