◎ 题干
With a lot of tough problems _____, the pilot was still calm, cool and collective under pressure.

[     ]

A. solve
B. solved
C. solving
D. to solve
◎ 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“With a lot of tough problems _____, the pilot was still calm, cool and collective under pressure. [ ]A. solve B. solved C. solving D. to solve …”主要考查了你对  【不定式】  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。