单项选择题

Even the best students cannot answer this question. It （）be very difficult.

A.should
B.must
C.need

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单项选择题
John Hill, （）born in Maryland, grew up in New York.

A.when
B.before
C.though
单项选择题
He knew nothing about it （）his friend told him.

A.until
B.if
C.because
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