题目内容
Because of the shortage of coal in England, attempts ________ to use natural gas as a source of power.
A. have madeB. will have been made
C. are being madeD. will be making
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题目内容
Because of the shortage of coal in England, attempts ________ to use natural gas as a source of power.
A. have madeB. will have been made
C. are being madeD. will be making