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【简答题】
设G={1，-1，i，-i}，其中i是虚数单位，证明(G，·)是循环群．
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举一反三
【单选题】My father promised that he ___ me a ten-speed bicycle as a present.
A.
bought for
B.
would buy
C.
had bought
D.
has bought
【简答题】My bicycle () a flat tire and I had to walk.
【简答题】At the time, I would go out in the evening with my parents. But this time I had borrowed a bicycle from a friend of mine. I didn’t know why, but once I was on my own bicycle, a kind of free feeling fl...
【简答题】He had his bicycle yesterday．
【单选题】When I came back, I found my bicycle __________.
A.
had gone
B.
has gone
C.
was gone
D.
is gone
【简答题】I had a bicycle a______ (事故) and broke my leg.
【简答题】冷藏的草莓的编码是__________
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