单项选择题

Tom placed too much ______ on sports but not enough on his studies.

A．interest
B．emphasis
C．efforts
D．time
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单项选择题
These compounds could not have been formed if the chemical reaction ______ stopped.
A．have been
B．has been
C．had been
D．were
单项选择题
He had lived in Paris for some years ______ he returned to Americ
A． afterB. untilC. beforeD. while
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