◎ 题干
This is _______ difficult problem that few students can work it out.

[     ]

A. so
B. so a
C. such
D. such a
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“This is _______ difficult problem that few students can work it out. [ ]A. so B. so a C. such D. such a …”主要考查了你对  【不定冠词(a,an)】【固定搭配】  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。