题目内容
18．It is necessary ______ us to help our friends out when they meet difficulties．（ ）| A． | to | B． | of | C． | with | D． | for |
分析 对我们来说，当我们的朋友遇到困难的时候帮助他们走出困境很有必要．
解答 答案：D
结合语境可以推测本句句意是"对我们来说，当我们的朋友遇到困难的时候帮助他们走出困境很有必要．"，从整体来看本题用的句型是：It's+形容词+of/for sb．+to do，由于本句中的形容词necessary 修饰事而不是修饰人表示人的品格，所以用介词for，表"对于"．故答案为D．
点评 了解每个介词的含义是做好此类题型的关键，还要从句意着手，根据句意作出解答；所以，平时的学习中要多进行积累词汇，才能很好的完成．
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