[求助]prep 110 正确答案的并列成分之间为什么没有 and

(B) Having processed nearly three quarters of all immigrants who enter the United States in the first quarter of the twentieth century, the federal immigration station on Ellis Island first opened in 1892 and then was rebuilt in 1900.

(C) Processing nearly three quarters of all immigrants to enter the United States in the first quarter of the twentieth century, the federal immigration station on Ellis Island first opened in 1892, being rebuilt in 1900.

(D) First opened in 1892, then rebuilt in 1900, the federal immigration station on Ellis Island processed nearly three quarters of all immigrants entering the United States in the first quarter of the twentieth century.

(E) Of all immigrants to enter the United States in the first quarter of the twentieth century, the federal immigration station on Ellis Island processed nearly three quarters of them, having first opened in 1892 and rebuilt in 1900.

其他的考点都清晰, 只是这里为什么没有and,

是因为有then 的缘故吗?

多谢!!

我以为是一当一个插入语吧

then 是 adv 不能当连词用的

有道理.

Moreover,这是朗文的一个例句:

Mix the flour and butter, then add the eggs.

是不是then 就可以这样用呢? I mean, 连接两个动词, 不需要 and.

By the way, I like your "signature".