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几个英语问题1.His father told me that he had left for the USA thre

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几个英语问题
1.His father told me that he had left for the USA three days before .为什么最后只能用before不能用ago?
2.The water of the lake were so ___that it looked like glass.
A.silent B.calm C.still D.quiet 为什么答案是b
3.As i know,there's ___a car in this place.
A.no such B.no a C.nor such D.no such a 为什么答案是A
1,ago只能用于过去时态的句子当中,不能用于完成时态
2,calm有风平浪静的意思,可以用来形容水,如 The sea looks calm and smooth,slient主要用于人,指保持的安静,still也有静止的意思,但更侧重于没有发生变化,D,quiet则多指一种安宁的气氛.
3,C项明显搭配不对,D项重复冠词a,也不对,B项不这么说,一般说there is no cars,这是一种人们说话的习惯,到这里就不能再死扣语法了,要结合语境.