问题
选择题
34. The space is left to let the rail expand when it gets hot, ______?
A．isn’t it
B．is it
C．doesn’t it
D．does it
答案
答案：A
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34. The space is left to let the rail expand when it gets hot, ______?
A．isn’t it
B．is it
C．doesn’t it
D．does it
答案：A