So difficult ____that no one could ___ a good solution to it.
A．was the problem; come up with
B．the problem was; come up with
C．the problem was; put up with
D．was the problem; put up with
◎ 答案
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◎ 解析
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◎ 知识点
根据n多题专家分析，试题“So difficult ____that no one could ___ a good solution to it.A．was the problem; come up withB．the problem was; come up withC．the problem was; put up withD．wa…”主要考查了你对 【现在分词的被动式】，【现在分词】，【不定式的被动式】，【过去分词】 等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。
◎ 相似题
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