单项选择题

When and where the new hospital will be built ______ a mystery.

A．to remain
B．remains
C．remain
D．is remaining
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单项选择题
It was the old man ______ has reported the fire.
A．that
B．which
C．who
D．since
单项选择题
Would you like a cup of coffee first, ______ shall we get down to business right now
A．then
B．when
C．or
D．otherwise
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