关于then 连词or副词？

clumsy123

我在白勇的语法书上看到THEN是副词，然后看到其他一些cders也说then是副词
但是我在上XDF的时候，语法老师说then是连词
而且看到一些句子也觉得它像连词，类似and的用法，例如：
The owner of Steele’s Grocery in Osage, Ohio, saved $600 monthly on heat during the winter by putting all his refrigerator air compressors together in an insulated compartment, then installing two fans and a duct that carried waste heat from the compressors into the main part of the store.

(A) then installing two fans and a duct that carried

(B) then he installing two fans and a duct that carried

(C) then two fans were installed with a duct that carried

(D) installing two fans, and then carrying through a duct

(E) installing two fans, and a duct carrying

答案是A


求解释~！

Gail小M

The only right structure here should be" D", by putting...,installing.....and then carrying....

however "and then carrying through a duct waste heat from the compressors into the main part of the store." the expression is awkward.

A is still the best here, but I think “AND” is necessary in choice A.

hscryzer

这个问题能拿出来复盘一下么？查英文字典的确没有查到then可以做连词的解释，不过有道中有

看一下下面一道题目

1. The original building and loan associations were organized as limited life funds, whose members made monthly payments on their share subscriptions, then taking turns drawing on the funds for home mortgages.

(A) subscriptions, then taking turns drawing

(B) subscriptions, and then taking turns drawing

(C) subscriptions and then took turns drawing

(D) subscriptions and then took turns, they drew

(E) subscriptions and then drew, taking turns


C为OG给出的答案，但是对A的解释是不平行，那么官方的意思是这里他们也把then作为连词看待了？