问题补充:
It took a long time for the effective use of natural gas.
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:可联系答.案.网客服索取。
时间:2018-09-30 10:05:29
It took a long time for the effective use of natural gas.
A. to be made
B. to make
C. being made
D. making
(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。