单项选择题

Once he has made up his mind to do something, it is impossible to stop him （）it.

A.to do
B.do
C.from doing

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It's midnight, but there's a light （）in the library.

A.on
B.off
C.away
单项选择题
It （）heavily last Saturday and there was deep snow in the garden.

A.snows
B.snowed
C.has snowed
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