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
The teacher has his students ______ a composition every other week.
A．to write
B．written
C．writing
D．write
单项选择题
No sooner had they got off the train ______ it started moving.
A．when
B．than
C．then
D．after
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