题目列表(包括答案和解析)
It took a long time for the effective use of natural gas_________．
A. to be made B. to make C. being made D. making
It took a long time for the effective use of natural gas_________．
A. to be made B. to make C. being made D. making
It took a long time for the effective use of natural gas_________．
A. to be made B. to make C. being made D. making
It took a long time for the effective use of natural gas_________．
| A．to be made | B．to make | C．being made | D．making |
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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