Three million tons of coal is exploited every year in the city,为什么用is不是应该用are

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• Three million tons of coal is exploited every year in the city,为什么用is不是应该用are
• 英语主谓一致语法Three million tons of coal ______ every year in the city.1 Three million tons of coal （——） every year in the city.A.is exploited B.are exploitedC.had exploited D.have exploited 2 Ten thousand tons of coal （——） produced last year.A was B were C is D are
• 6.Three million tons of coal ______ every year in the city.A.is exploited \x05B.are exploitedC.had exploited\x05D.have exploited选b对吗,为什么?
• Three million tons of coal is exploited every year in the city,为什么用is不是应该用are
• 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?
• 6.Three million tons of coal ______ every year in the city.A.is exploited \x05B.are exploitedC.had exploited\x05D.have exploited选b对吗,为什么?
• Three million tons of coal was/were exported last year.A ton of apple has/have been sold.（应该是 a ton of apples 不小心打错了）