three tons of coal was/were exported 哪个对
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three tons of coal was/were exported 哪个对
three tons of coal was/were exported 哪个对
three tons of coal was/were exported 哪个对
应该是were.
因为词组的中心词是tons.
three tons of coal was/were exported 哪个对
three tons of coal was/were exported 哪个对
three tons of coal was/were exported 哪个对
应该是were.
因为词组的中心词是tons.