题目内容
With a lot of tough problems _______ , the pilot was still calm, cool and collective under pressure.
[2011北京高三检测]
A.solve B.solved C.solving D.to solve
【解析】选D。由下文可知这些问题还没有解决,故应用不定式形式,又因为solve在本句中有其动作的执行者the pilot,故应用主动形式。
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