It will take a long time for the effective use of natural resources .A. to be madeB. to m

问题补充：

It will take a long time for the effective use of natural resources .

A. to be made

B. to make

C. being made

D. making

答案：

(答案→)A. to be made

B. to make

C. being made

D. making

解析：考查不定式的用法：句意：实现天然气的有效使用花了很长时间。原句可改为：To make the effective use of natural gas took a long time.这里使用的是It will take +一段时间+to do sth，不定式是这句话的主语，it是形式主语，而且the effective use of natural resources和make是被动关系，选A。