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Travelerstousemobilephoneswhileflying.A.donallowB.aren'tallowedC.won'tallowD.didn'tallow谁给我解释下这题呢

题目详情
Travelers _____ to use mobile phones while flying.
A.don allow
B.aren't allowed
C.won't allow
D.didn't allow
谁给我解释下这题呢
▼优质解答
答案和解析
B 这是被动语态.在飞形时乘客不被允许使用手机.be+done被动态模式