6.Three million tons of coal ____A__ every year in the city.

6.Three million tons of coal ____A__ every year in the city. 6.Three million tons of coal ______ every year in the city. 6 Three million tons of coal ________ every year in the city 英语主谓一致语法Three million tons of coal ______ every year in the Three million tons of coal is exploited every year in the ci Three million tons of coal ___ exploited every year.A is B a Three million tons of coal was/were exported last year.A ton In Britain people __four million tons of potatoes every year Three million tons of coal was/were exported It was reported that three million tons of coal----exported Each year over three million people( )the city of Pisa. 阅读Every year 2.2 million tons of oil are spilled into the oc