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His earnings were only half the amount___ A.they used to be

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His earnings were only half the amount___ A.they used to be B.they used to 为什么选A,不选B.
His earnings were only half the amount___ A.they used to be
在跟过去做对比时,前后动词必须一致,其他动词可省略但 be 动词不可.
例如:
His weight is twice as much as it used to be.
主语是 his weight ,后半句中由 it 替代了;谓语是 be 动词.
He weighs twice as much as he used to (weigh).
主语是 he,动词是 weigh
这样解释希望你就能理解了.