It took a long time for the effective use of natural gas_________． A. to be made B. to make C. bein...
2023-02-13 08:01:43 219次 浙江省学军中学2010届高考全真模拟试题 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
It took a long time
for the effective use of natural gas_________．
A. to be made B.
to make C. being made D.
making
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