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Themathproblemissohard.Ireallydon'tknow

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問題詳情:

Themathproblemissohard.Ireallydon'tknow

The math problem is so hard.I really don't know________.

         to do it    to do       to do it

【回答】

A

知識點:非謂語動詞

題型:選擇題

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