单项选择题

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

A．must drop it
B．should have dropped it
C．must have dropped it
D．had dropped it
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单项选择题
I wish I could speak French ______ as John.
A．as good
B．as better
C．as well
D．as best
单项选择题
I can't keep ______ the teacher who speaks so fast.
A．up
B．up with
C．with
D．on with
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