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英语:倒装4He believed,___,that people should start as early as p

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英语:倒装4
He believed,___,that people should start as early as possible to look at the world and at nature and to think about what they saw.
a.as his mother does
b.as did his mother
为什麽答案是b?为什麽一定是过去式啊?
选B原因:此处的as与so同一个意思,so do I/as do I是同样的用法.因为believed为过去式,所以此处用as did his mother而不用does.