By 2050 the level of industrial pollution __________ dangerous levels in many cities.
will have reach
will has reached
will have reached
will reach
人气：333 ℃ 时间：2020-05-21 17:28:12
解答
will have reached
前面的by 2050表将来时态,这里应该用将来完成时,意思是到2050年,许多城市的工业污染程度将会达到危险的程度
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