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
He knew nothing about it （）his friend told him.

A．until
B．if
C．because
单项选择题
I heard （）singing loudly in the next room.

A．she
B．hers
C．her
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