three tons of coal后面用is 还是are
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three tons of coal后面用is 还是are
three tons of coal后面用is 还是are
three tons of coal后面用is 还是are
用are因为tons是复数
three tons of coal后面用is 还是are
three tons of coal后面用is 还是are
three tons of coal后面用is 还是are
用are因为tons是复数