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 Ithinkit'swellworth

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問題詳情:

 Ithinkit'swellworth

 I think it's well worth ______ our best to learn a second language well.

A. to try                     B.    trying                    C.   try                 D.   tries

【回答】

B

知識點:動詞和動詞短語

題型:選擇題