◎ 题干
If his parents are convinced _____ the fact that his son always focuses his mind _____ his study.
[     ]
A. of; on
B. of; at
C. by; to
D. on; at
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“If his parents are convinced _____the fact that his son always focuses his mind _____his study.[ ]A. of; on B. of; at C. by; toD. on; at …”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。