单项选择题

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单项选择题
When you go by bus in England,you must be careful because ______ .
A．you may go the wrong way
B．there are too many buses there
C．there are big buses with two floors
单项选择题
People on foot can go across the road when ______ .
A．the traffic lights are green
B．they look to the right
C．the road is clear
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