In New York City alone,six major institutions have spread up

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/29 04:15:24

In New York City alone,six major institutions have spread up and out into the air space and neighborhoods around them ___ are preparing to do so.
A.which B.or C.so that D.and
Why meaning?

In New York City alone,six major institutions(have spread up and out into the air space and neighborhoods around them) ___ (are preparing to do so).
括号内的两部分在成分上是并列的.
意思为：六大主要研究所已经开始向外扩展并进入周围的空间以及邻区,(或者)正在准备这样做.
所依据题意,只能选择or.

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