单项选择题

My wallet is nowhere to be found. I ______ when I was on the bus.

A．must have dropped it
B．must drop it
C．should have dropped it
D．ought to have dropped it:
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单项选择题
The time will come ______ man can fly to outer space freely.
A．that
B．when
C．in that
D．which
单项选择题
They sent us their statement, ______ to get our support.
A．hoped
B．to hope
C．hoping
D．having hoped
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