单项选择题

Let's ______ when the ship will arrive.

A．find out
B．discover
C．find
D．invent
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单项选择题
There ______ some mistakes in your composition.
A．have
B．has
C．seems to be
D．seem to be
单项选择题
If we ______ yesterday, we ______ the work.
A．weren't interrupted... would finish
B．didn't interrupt... would have finished
C．hadn't interrupted... had finished
D．hadn't been interrupted... would have finished
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