题目内容

It took a long time for the effective use of natural gas ______.
A．makingB．being madeC．to makeD．to be made
D

试题分析：句意，能够有效地使用天然气，将花费很长的时间。分析句子结构，这里需要不定式作定语，“natural gas”与“to make”之间是被动关系，所以应该使用不定式的一般式的被动形式。
点评：不定式、动名词、现在分词、过去分词作定语的区别：不定式作定语往往表示未发生的动作或通常发生的动作，一般放在被修饰词后面；动名词作定语往往表示某种用途，一般放在被修饰词的前面；现在分词作定语表示主动、正在进行的动作，过去分词作定语表示被动或完成意义。
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