转换句式4.Mobile phones used to be very expensive.Mobile phones______as expensive as they__ ____to be.

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转换句式4.Mobile phones used to be very expensive.Mobile phones______as expensive as they__ ____to be.
转换句式
4.Mobile phones used to be very expensive.
Mobile phones______as expensive as they__ ____to be.

转换句式4.Mobile phones used to be very expensive.Mobile phones______as expensive as they__ ____to be.
楼主确定问题没有错?后面是两个空格还是一个空格?
如果是两个空格是没法做的.如果是一个空格的话那答案就是前一空填weren't 后一空填used
我觉得初三的英语不会出很复杂的问题的,所以应该是你在写这道题的时候在打横线的时候出现了一个小错误吧?

Mobile phones were not as expensive as they used to be