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Because of the Russian gas limit to Europe, attempts to use botanical fuel as a

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Because of the Russian gas limit to Europe, attempts to use botanical fuel as a

Because of the Russian gas limit to Europe,attempts _______ to use botanical fuel as a source of power.

A.have made

B.having made

C.are being made

D.will be making

 

试题答案

【答案】

C

【解析】略