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 Iwaspreparingmystudentsforthecomingconcert

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問題詳情:

 Iwaspreparingmystudentsforthecomingconcert

 I was preparing my students for the coming concert ____________ Robert came and asked me if he could be in the concert, too.

  A. since                    B. as                          C. while                       D. when

【回答】

D

知識點:連詞

題型:選擇題

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