It was some time later_____we realized the truth.

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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,

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句子,连接两个完整句的标点应是分号不是逗号.
第三题通常来说,我们会说it's a matter of sth是固定搭配,表示这是关乎于什么什么的事情.类似的matter的固定搭配还有as a matter of fact.
第四题since表示自从,连接时间状语从句,when是先行词.
另外,since when 单用也可.
1表示疑问,从什么时候开始,
--I've been hanging out with Jim.
--Since when?
2表示气愤,何曾,什么时候.
--Since when did he ever listen to me?!
加油!

It was some time later_____we realized the truth. It was some time ______ we realized the truth.A. It was some time _____ we realized the truth. 问一道英语选择题It was some time _______ we realized the truth.A.whe 1.It was some time___we realized the truth 1.it was some time __ we realized the true 一道高二英语语法题it was some time（） we realised the truth选项有 before ___he realized it was time to go back home. 求“I suddenly realized that tom was not telling the truth ”的中 I (realized)(understood)he was not telling me the truth 选择正确 it was some time-------- we realied the turth It's time to face the truth这句是什么意思?