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
An old friend from abroad, ______ I was expecting to stay with, telephoned me from the airport.
A．that
B．whom
C．as
D．which
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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