单项选择题

How the fire in the dancing hall started （） a mystery.

A．to remain
B．remains
C．remain
D．is remaining

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单项选择题

The middle-aged man was seen （） out of the house on the afternoon of the murder.

A．came
B．Come
C．to come
D．have come

单项选择题

--Can I help you --I' d like to have a （） of China Daily.

A．piece
B．sheet
C．loaf
D．copy

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