问题
选择题
Travellers _____ to use mobile phones while flying.[ ]
A. don't allow
B. aren't allowed
C. won't allow
D. didn't allow
答案
答案：B
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Travellers _____ to use mobile phones while flying.[ ]
A. don't allow
B. aren't allowed
C. won't allow
D. didn't allow
答案：B