摘要： 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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It took a long time for the effective use of natural gas_________．
A. to be made B. to make C. being made D. making
查看习题详情和答案>>It took a long time for the effective use of natural gas_________．
A. to be made B. to make C. being made D. making
查看习题详情和答案>>It took a long time for the effective use of natural gas_________．
A. to be made B. to make C. being made D. making
查看习题详情和答案>>
It took a long time for the effective use of natural gas_________．
| A．to be made | B．to make | C．being made | D．making |