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

The atmosphere in the crowded hall became so stifling that two of the old ladies

A. passed off
B. passed up
C. passed through
D. passed out

单项选择题

The Gadfly was too much exhausted to wake easily ______.

A. when once asleep
B. as once asleep
C. while once sleeping
D. when once sleeping

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