题目

It was some time later_____we realized the truth.
A.until B.before C.that D.since
我想问的是,这个可不可以看作是一句强调句呢,选C为什么不行呢?
还有一题
All the flights ____because of the snowstorm,we had to take the train instead.
A.were canceled B.had been canceled C.having canceled D.having been canceled
我想问B行不行?为什么?
还有
I can not say which wine is best___it is a ______of personal taste.
A.affair B.event C.matter D.variety
为什么要选C
还有最后最后一道呵呵
The book was written in 1946,____theenducation system has witnessed great changes.
A.when B.during which C.since then D.since when
但是我想问since不是介词吗,可以放在when前面?那能不能帮我分析下这句话的成分呢,

提问时间：2020-08-04

答案

第一题不能是强调句,因为去掉it that之后不是完整的句子成分第二题如果是日常口语的话,用B没问题,但是作为严谨的书面形式,前半句应是独立主格结构表原因,所以用动名词.另外更细一点说,如果用了B那么此处就是两个完整...