6 Three million tons of coal ________ every year in the city. A is exploited B are exploited C had exploited D have exploited为什么选B 不是该用完成时吗?
问题描述：
6 Three million tons of coal ________ every year in the city.
A is exploited B are exploited C had exploited D have exploited
为什么选B 不是该用完成时吗?
答
要用完成时也应该用完成时的被动语态啊have/had been exploited
答
要用完成时的话后面要加been，表被动
tons 是可数名词要用are，整句是个被动语态，必须加BE动词
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
答
coal(煤)事不可数名词