单项选择题

It was the old man______ has reported the fire.

A．that
B．which
C．who
D．since
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单项选择题
-- I can't find John. -- Look! He ______a blue jacket today.
A．is having on
B．puts on
C．is wearing
D．dresses
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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