◎ 题干
Hard as a teacher may try, he can't ____ to make all his students make a difference in study, letting alone in life.

[     ]

A. ensure
B. be sure
C. guarantee
D. insure
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Hard as a teacher may try, he can't ____ to make all his students make a difference in study, letting alone in life. [ ]A. ensure B. be sure C. guarantee D.…”主要考查了你对  【动词】  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。