单项选择题

I couldn't sleep last night because the tap in the bathroom was ______.

A．draining
B．dropping
C．spilling
D．dripping
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单项选择题
______ as the census taker of the sky , Annie Jump Cannon contributed considerably to the field of astronomy.
A．Known
B．Knowing
C．To know
D．Knowledge
单项选择题
Had the United States built more homes for the poor people in 1955, the housing problem now in some parts of the country ______ so serious.
A．wouldn't be
B．will not have been
C．wouldn't have been
D．would have not been
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