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20.My brother had an accident while____ how to ride a bicycle.
(A)learned
(B) was learning
(C) had been learning
(D) learning

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MyPrince 國三上 (2017/08/21)
★榜首的解題★：20.My brother had an accident while____how to ride a bicycle. (A)learned(B) was learning(C) had been learning (D) learningMy brother had an accident while____how to ride a bicycle. 上句原句是 My .....觀看完整全文，請先登入


20.My brother had an accident while____h..-阿摩線上測驗