(2013·河南豫西五校质量检测)The text is too difficult. The explanation of our teacher will help make it easy .
A. to understand
B. to be understood
C. understood
D. understanding
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(答案→)A. to understand
B. to be understood
C. understood
D. understanding
解析：选A 考查非谓语动词。句意：这篇文章太难了，我们老师的解释会使它易于理解。此处用动词不定式的主动表示被动。此种用法常用于“be＋性质形容词＋不定式”结构中，此类形容词有easy, hard, interesting等。