Three million tons of coal is exploited every year in the ci

Three million tons of coal is exploited every year in the ci Three million tons of coal ___ exploited every year.A is B a 6.Three million tons of coal ____A__ every year in the city. 英语主谓一致语法Three million tons of coal ______ every year in the 6.Three million tons of coal ______ every year in the city. 6 Three million tons of coal ________ every year in the city 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 Two million tons of oil _____ exploited in this area that ye three tons of coal后面用is 还是are