自考《英语（一）》试题练习：虚拟语气及被动用法（11.13）
2013-11-13 09:06 自考365
单选题
1.[2007.10]We request that all cell phones______for the duration of the performance.
A.be turned off
B.should turn off
C.ought to be turned off
D.to be turned off
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