单项选择题

If someone ever shed a tear （）your drinking，then you are an alcoholic.

A.because of
B.because
C.as
D.since

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单项选择题

China is the second （）country in the world，next to Canada.

A.large
B.larger
C.largest
D.largely

单项选择题

While I was still a boy，I came （）the conclusion that there were three grades of thinking.

A.of
B.at
C.to
D.on