How can I ever concentrate if you continuall me with silly questions?A. have-interrupted B. had interruptedC. are-interrupting D. were-interrupting 题目和参考答案——青夏教育精英家教网—

题目内容

How can I ever concentrate (集中精力) if you continuall me with silly questions?

A. have…interrupted B. had interrupted

C. are…interrupting D. were…interrupting

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