单项选择题

The helicopters couldn' t get close to the building because the building was surrounded (包围) by thick smoke.

A．Right.
B．Wrong.
C．Doesn't say.
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单项选择题
The fire lasted four hours before the firemen put it out.
A．Right.
B．Wrong.
C．Doesn' t say.
单项选择题
A．willB．mustC．shall
A．will
B．must
C．shall
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