Unlikethefossilfuelsoftoday,biofuelsarerenewablesources...

問題詳情：

Unlike the fossil fuels of today, biofuels are renewable sources, which mean that they will not ____ easily.

A. come out      B. break out       C. turn out      D. run out

【回答】

D

知識點：動詞

題型：選擇題