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If the population of the Earth goes on increasing at its present rate, by the middle of the 21st century we______all the oil tha
If the population of the Earth goes on increasing at its present rate, by the middle of the 21st century we______all the oil tha
admin
2012-08-22
49
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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