Itisoneoftheimportantproblems

发布时间:2020-07-27 19:21:46

It is one of the important problems ________ tomorrow.A.to solveB.to be solvedC.solvedD.solving

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B解析句尾提示词tomorrow,表示将来,要用不定式结构,又逻辑主语是problems,所以要用被动语态。
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