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问题: 有一道英语选择题!!!

Please don't go into his room_____you're asked.Do you understand??

A.except B.besides C.except that D.except when

解答:

Please don't go into his room_____you're asked.Do you understand??

A.except B.besides C.except that D.except when
答案应是D
记得高中老师说过,用到except引导的从句时,可以把他去掉,句子仍是完整的。
这里是please go into his room when you re asked. do u understand?