The country has already sent up three unmanned spacecraft, the most recent ______

来源：百度知道编辑：UC知道时间：2024/06/01 10:22:45

The country has already sent up three unmanned spacecraft, the most recent ______at the end of last March .
A. has been launched
B. having been launched
C. being launched
D. to be launched
选B 解析上说此句前后句没连词，只有逗号是不能连接两个句子的,所以后边the most recent ______ at the end of last March就是独立主格的形式了，在句中做伴随状语

这是什么意思啊？

这个是独立主格结构解释是正确的
首先一个句子在没有连词的情况下,只能有一个谓语动词.
着句话前面已经有了has already sent up做谓语动词了,逗号不能连接两个完整的句子,所以A答案是最迷惑的,如果是分号或者有个连词and就可以用A.
如Everyone being ready, the teacher began his class.后面一句是个完整的句子,前面一句谓语就用ing分词的形式做伴随状语.相当于when everyone is ready.
The boy leading the way, we had no trouble finding the strange cave.这句也是一样,the boy leading the way也是独立主格,不过是做原因状语.相当于beasue the boy led the way
My health allowing, I will work far into the night.这个前面部分也是独立主格结构,不过是做条件状语,相当与if my health allows .
注意如果有连词了,句子的谓语动词和做独立主格的句子的"谓语部分"的区别.

简单告诉你，这是独立主格结构，
名词+非谓语，事情发生在过去，所以用现在分词完成时
前面部分相当于一个名词

那为什么用have 不用has呢？不是the most recent 吗，不是指一个吗？

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