His earnings were only half the amount___ A.they used to be B.they used to 为什么选A,不选B.
题目
His earnings were only half the amount___ A.they used to be B.they used to 为什么选A,不选B.
答案
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 ...
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