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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 【查看更多】

 

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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

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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

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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

 

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

A．to be madeB．to makeC．being madeD．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

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