◎ 题干
The problem is very difficult, so many students can't ____.
[     ]
A. work them out
B. work it out
C. work out them
D. work out it
◎ 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“The problem is very difficult, so many students can't ____. [ ]A. work them outB. work it out C. work out them D. work out it …”主要考查了你对  【人称代词】【动词短语】  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。