单项选择题

I was out of town at the time, so I do not know exactly how it ______.

A．was happening
B．happened
C．happens
D．has happened
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单项选择题
—Do you have enough to ______ all your daily expenses —Oh yes, enough to spare.
A．cover
B．spend
C．fill
D．offer
单项选择题
Mary and I see each other ______, but not as often as we used to.
A．sooner or later
B．once in a while
C．in the end
D．more or less
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