单项选择题

What would you do if war _________

A．breaking out
B．will break out
C．breaks out
D．were to break out
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单项选择题
______ that Martin had passed the important exam, his friends called to congratulate him.
A．Having been heard
B．To have heard
C．Being heard
D．Having heard
单项选择题
Although__________ happened in the Arctic region sounds like fairy tale, it truly exits.
A．it
B．what
C．which
D．that
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