If the population of the Earth goes on increasing at its present rate, by the mi

游客2025-03-25 21

问题 If the population of the Earth goes on increasing at its present rate, by the middle of the 21stcentury we______all the oil that drives our cars.

选项 A、will use up
B、will have used up
C、have used up
D、will have been using up

答案 B

解析到将来某一时刻为止已发生了的动作，要用将来完成时。一般说来，如果句中有by引导的时间状语，谓语就应用完成式，并根据具体时间确定是现在、过去还是将采完成式。如：by now(现在完成式)；by l960(过去完成式)；by 2010(将来完成式)。

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