It be difficult to get a train ticket during traditional Chinese Spring Festiv

题干

It be difficult to get a train ticket during traditional Chinese Spring Festival this year because there are many ticket windows.

A．mustn't

B．ought to

C．needn't

D．can't

上一题下一题 0.64难度单项选择更新时间:2012-10-18 09:21:42

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