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 Onecan'tdoextremesports

練習題2.97W

問題詳情:

 Onecan'tdoextremesports

 One can't do extreme sports ________ he or she has had some training.

A.if               B.unless          C.once          D.since

【回答】

B

知識點:連詞

題型:選擇題

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