新2 80课习题部分 With fewer bison,grass shoots were not eaten,so grass did grow as strongly. 解析说省略了一个as，那完整的句子是不是

With fewer bison,grass shoots were not eaten,so grass did grow as strongly. as it were.
这个句子感觉不太懂…前面两小句是不是属于原因状语呢？

网校学员WL0**在学习新概念英语1、2、3、4册连读【抢学班】时提出了此问题。

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