单项选择题

I hadn't seen him for years, but I ______ his voice over the telephone.

A．realized
B．discovered
C．accepted
D．recognized
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单项选择题
They sent us their statement, ______ to get our support.
A．hoped
B．to hope
C．hoping
D．having hoped
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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