单项选择题

You ______ John in the street this morning. He's been dead for ages.

A．mustn't see
B．mustn't have seen
C．couldn't see
D．couldn't have seen
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单项选择题
You have no one but yourself to ______ for the fault.
A．accuse
B．blame
C．charge
D．criticize
单项选择题
______ the new fund-raising plan is approved, we will soon have more money to build the gymnasium.
A．While
B．Given
C．Unless
D．Even if
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