問題詳情

10.Tim: Ben, why are you taking out your smartphone? No one can use a smartphone in class.
 Ben: I know. I already turned it off _________ the class started. I just want to check again.
(A) though
(B) after
(C) until
(D) before

參考答案

答案:D
難度:計算中-1
書單:沒有書單,新增

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