单项选择题

"How did you spend the night" "We had a very hard time ______ some of the problem."

A．discussing
B．to discuss
C．of discussing
D．on discussing
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单项选择题
Don't ______ the news to the public until we give you the go - head.
A．relieve
B．retain
C．release
D．remain
单项选择题
There were no tickets ______ for Sunday's classical music concert.
A．preferable
B．considerable
C．possible
D．available
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