(单选题)
Attention, please! All the mobile phones must ______ in the examination.
A.keep off
B.keep on
C.be kept on
D.be kept off
参考答案:D
知识点:
(单选题)
Attention, please! All the mobile phones must ______ in the examination.
A.keep off
B.keep on
C.be kept on
D.be kept off
参考答案:D
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