When后接从句与短语的用法区别与辨析

问题描述

When ______ from milk, the remainder is called skim milk. 

(A) all the butterfat is removed 

(B) removing all the butterfat that 

(C) is all the butterfat removed 

(D) the removal of all the butterfat  

求助这道英语选择题并且为什么这么选?

老师答疑

黎老师：

When _____ from milk, the remainder is called skim milk. 

(A) all the butterfat is removed 

(B) removing all the butterfat that 

(C) is all the butterfat removed 

(D) the removal of all the butterfat  

根据题意，答案应该选择 (A)all the butterfat is removed  

题意：当所有的乳脂被从牛奶中除去的时候，剩余物叫做脱脂奶。