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If the population of the Earth goes on increasing at its present rate, by the mi
If the population of the Earth goes on increasing at its present rate, by the mi
游客
2025-03-22
12
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问题
If the population of the Earth goes on increasing at its present rate, by the middle of the 21st century 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、过去还是将来完成式。如:by now(现在完成式);by 1960(过去完成式);by 2010(将来完成式)。
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