问题
选择题
They live on a busy main road. ______ must be very noisy.
A．There
B．It
C．That
D．They
答案
答案：B
it 指环境。
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They live on a busy main road. ______ must be very noisy.
A．There
B．It
C．That
D．They
答案：B
it 指环境。