(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
参考解析:
考查动词短语辨析和动词的语态。句意:请注意!考试过程中禁止使用手机。keep on意为“继续,雇佣”;keep off意为“(使)不接近,挡住”。根据句意,主语All the mobile phones跟动词短语keep off之间为被动关系。故选D。
知识点: