I happened____ it in some book.A.to read B.to have read C.that I have read D.that I had read此题答案为B,可为什么不能选A?请给我一个让人完全信服的答案吧!

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I happened____ it in some book.A.to read B.to have read C.that I have read D.that I had read此题答案为B,可为什么不能选A?请给我一个让人完全信服的答案吧!
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I happened____ it in some book.A.to read B.to have read C.that I have read D.that I had read此题答案为B,可为什么不能选A?请给我一个让人完全信服的答案吧!
I happened____ it in some book.
A.to read B.to have read C.that I have read D.that I had read
此题答案为B,可为什么不能选A?请给我一个让人完全信服的答案吧!

I happened____ it in some book.A.to read B.to have read C.that I have read D.that I had read此题答案为B,可为什么不能选A?请给我一个让人完全信服的答案吧!
happen to 表示偶然地,所以排除CD.至于A和B,其实主要是意思的层面,这句话的意思是：我恰巧在其它书里面读过它.表示的意思是完成式,所以相比较A而言,B更好一些.而其实A从语法方面是没有任何错误的

A 表示碰巧发生 而Bhappen to have done 强调do的动作已经发生过了，to have done是to do的完成式

A.to read 动词不定式的一般时，表示与谓语同时或之后发生。
B.to have read 动词不定式的完成时，表示在谓语之前发生。

I happened____ it in some book.A.to read B.to have read C.that I have read D.that I had read此题答案为B,可为什么不能选A?请给我一个让人完全信服的答案吧! 3.I happened____(meet)my old friend in the street yesterday.I____(not see)him for a long time为什么不用had not seen 三道英语不定式题目1.He happened____(telephone)when I went in.2.The girl pretended ___(listen)when the teacher looked at her.3.Charles Babbage is generally considered ___the first computer.A.TO have invented B.inventing C.to invent D.having i i said it in i see it all in I thank it's in your grandparents' i can't put it in words I know it in English.意思 I've made it in time i feel it in my gut I must use it in the yard. i ---- clean it in a minute I'm in it for me i don't wanna rub it in i read it in the 翻译 Though I'm ( ) in English,I can not learn it well.I hope I can ( ) it. I water it again and put it in the sun 到底是I can speak it in English.还是I can say it in English.