It took a long time for the effective use of natural gas．A. to be madeB. to makeC. being m

发布时间：2020-08-16 10:32:07


It took a long time for the effective use of natural gas    ．
A. to be made
B. to make
C. being made
D. making

网友回答

(答案→)A. to be made
B. to make
C. being made
D. making
解析：可联系答.案.网客服索取。
以上问题属网友观点，不代表本站立场，仅供参考！