题目内容

It's ages _______her.

A. since I saw
B. that I didn't see
C. since I didn't see
D. ago I saw

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________you study harder,you 'll never pass the exam

A. If
B. Until
C. Unless
D. because

进行有名值等值电路计算式,变压器的变比为( )

A. 从基本级看过去的变比
B. 额定变比

---What did you do the day before yesterday?---I __________ for an English test.

A. study
B. studied
C. studying
D. studies

----Wendy, how long have you had the Huawei P30 Pro?----A couple of days. I______it last week.

A. bought
B. buy
C. will buy
D. have bought

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