◎ 题干
Let's learn to use the problem we are facing _____ a stepping-stone to future success.

[     ]

A. to
B. for
C. as
D. by
◎ 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“Let's learn to use the problem we are facing _____ a stepping-stone to future success. [ ]A. to B. for C. as D. by …”主要考查了你对  【介词和介词短语】  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。