6 Three million tons of coal ________ every year in the city. A i_英语解答

6 Three million tons of coal ________ every year in the city.
A is exploited B are exploitedC had exploitedD have exploited
为什么选B 不是该用完成时吗?

人气：147 ℃　时间：2019-11-10 08:51:53

解答

..首先,要注意 "every year "...因为事 every year ,所以不能用完成时,而且,即使要用完成时的话,后面也要捷been,表示被动,即have/had been exploited