单项选择题

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

A．Right.
B．Wrong.
C．Doesn't say.
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单项选择题
Helen Keller got very sick when ______.
A．she was a baby
B．she went to college
C．her teacher came to the home
单项选择题
The students were surprised to know green ______.
A．couldn't give the lesson
B．would go to a meeting
C．recorded her voice
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