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【单选题】
— Did you know any French before you arrived in Washington? — Never ______ it, actually.A.
had I learned
B.
have I learned
C.
I learned
D.
was I learning
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举一反三
【单选题】是由粗大土粒在水或空气中下沉而形成的，全部由砂粒及更粗土粒组成的土都具有单粒结构是指土的结构类型中的（）。
A.
物理风化
B.
生物风化
C.
化学风化
D.
机械破坏
【单选题】Your health insurance plan covers the cost of your annual screening.>Insurance means the same as in sentence_______.
A.
He’s applying for two other jobs as an insurance against not passing the interview for this one.
B.
When her husband died, she received $ 50,000 in insurance.
C.
Cycle helmets provide insurance against a head injury.
【简答题】通信系统的基本结构是什么?各自的功能是什么?模拟电话的工作原理是什么?
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