Students mustn't smoke or drink while__ at school.A.studyB.studyingC.to studyD.studied
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Students mustn't smoke or drink while__ at school.A.studyB.studyingC.to studyD.studied
Students mustn't smoke or drink while__ at school.
A.study
B.studying
C.to study
D.studied
Students mustn't smoke or drink while__ at school.A.studyB.studyingC.to studyD.studied
B
while后面只能加进行时
而且此句是一个省略
应该是 Students mustn't smoke or drink while they are studying at school.
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Students mustn't smoke or drink while__ at school.A.studyB.studyingC.to studyD.studied
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