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It took a long time for the effective use of natural gas ． A. to be made B. to m

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It took a long time for the effective use of natural gas ． A. to be made B. to m

 It took a long time for the effective use of natural gas_________．

       A. to be made        B. to make                    C. being made        D. making

试题答案

A

标签：theforuseeffectivetook

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