Question

提一些英语问题It's twenty years < >he came to work in this school.

A.that B.since 答案是B，为什没不选A？

Stephen Hawking stressed to the interviews that his accomplishments would certainty have been achieved by others,< >
A.never had he lived B.had he never lived C.he had never lived D.never had he lived为什么选B?这句话又如何翻译？

Little < > i known when i took the trip where it could lead me.为什么用did不用had？

He did not teach himself to paint < >he was in his twenties.
这是一道填词题，我写的是before，答案是until ，不知可不可以用before？

An idea suddenly floated into the weeping sailor's mind that he really < >an appetite for a peaceful life.为什么这道提填had而不是have？

Answer 1

1.如果选A的话，这句话就是一个强调句型，强调句型的一个判断有一个小窍门，去掉 it is和that，如果成分仍齐全，那么就是一个强调句型，这道题如果是强调句型，就是twenty years he came to work in this school.自然不完整。
2。这是一个虚拟语气，had he never lived 就是这句话的假设句。因为假设在过去，所以用的过去完成并将had 提前，这样翻译：Stephen Hawking 强调：如果他没有活下来的话，他的成就完全可以由别人取得。
3。Little < > i known when i took the trip where it could lead me.为什么用did不用had？不知道是题目有问题还是你不小心打错了，我觉得不应该是known,而应该是know. know的话，就选did了，little did i know应该可以算作一个固定搭配吧。
4。不可以。not until 是一个固定搭配，意为直到什么才。这样翻译：他知道二十岁才自学画画。
5。主从句时态应该保持一致，前面主句用的是一般过去时，所以后面从句也得用一般过去时了，用had.

Answer 2

B.since
这是个时间状语从句，since可以当引导词
that不可以充当时间状语从句的引导词

B.had he never lived
这是虚拟语气的省略形式，完整的是if he had never lived如果他没来到这个世上
这句话的意思是：霍金在采访中强调，如果没有他，他的那些成就也会被别人取得

He did not teach himself to paint < >he was in his twenties.
可以用before
not…until句型可与before互换用，但在强调句中一般仍用until。

An idea suddenly floated into the weeping sailor's mind that he really < >an appetite
时态要保持一致

Answer 3

1.it's +时间段+since sb. did sth. 自从……以来已经多长时间了 这是一个句型
2.这是有关虚拟语气省略if的句子，在由if引导的虚拟语气句中，谓语动词有had，were，should时，可将if省略，并将had，were，should提前，此句原句为if he had never lived,由于有had，所以把had提前变成had he never lived.
3.little，few,never, hardly,seldom, rarely, 等否定和半否定的词前置，句子要部分倒装。
4.否定+时间段+before 表示“…不久就……”
肯定+时间段+before 表示“过多久才……”
所以如果你用bifore则表示他自学画画才20多岁
用until表示“直到他20多岁时他才自学画画”
5.首先不可能填have，因为主语为he
其次，这是个idea的同位语从句，主句floated为过去时，所以应该时态一致，用过去式