◎ 题干
Though this question is very difficult, if you ________ trying you will find the right answer.

[     ]

A. keep up
B. keep on
C. keep out
D. keep off
◎ 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“Though this question is very difficult, if you ________ trying you will find the right answer.[ ]A. keep up B. keep on C. keep out D. keep off …”主要考查了你对  【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。