答案是什么并且要详细说明为什么

题目

答案是什么并且要详细说明为什么
1 As we know ,things like that _______ all over the world every day.
A.happens B.are happened
C.are happening D.will be happened
2.My uncle went to Australia last year.We haven't seen him __________.
A.since almost a year
B.from almost a year on
C.after almost a year
D.since almost a year ago
3.Catherine ______ the letter before her mother came into her bedroom.
A.has written B.was written
C.had written D.is writing
4.In recent years ,the economy of our country ____ rapidly.
A.is increased B.has increased
C.increased D.has been increased
5.Mr.Johnson’s story _____ by everyone who heard it.
A.laughed at B.was laughed
C.was laughed at D.laughed
6.—What is the weather like this summer here
—There _______ very little rain.
A.has B.has been
C.are D.have been
7.They ______ about eight hundred English words by the end of last term.
A.will learned B.had learned
C.are going to learned D.have learned

答案

1.C因为every day.说明是一般现在时,又因为事情不是被发生的,是主动的,且事情是复数,所以are happening
2.D首先 haven't seen 说明是现在完成时,后面可以加for+一段时间和since+时间点,所以A不对,对
3.C 因为 came 说明过去时,又因为这句话表示.Catherine 已经写好信,在她妈妈进来前,所以是过去的过去.
用过去完成时
4在近几年,我们国家的经济取得了高速的发展.In resent years是在不久之前几年,表示已经增长了.还会继续增长所以用现在完成时.不属于过去完成时的两种增长是主动,不是被“增长了..”所以选B
5C吧因为 Mr.Johnson’s story 是被嘲笑,是被动的,而且嘲笑的固定短语是laugh at 所以C
6Bthere be句型,故排除Athere be 句型的主语在后面,本句中是little rain 形容鱼要用单数形式,C D都是复数形式,不行.B采用的是完成时态,因为夏天天气怎么样是发生在提问之前,故用完成时
7D.因为后面的时间状语是by the end of last year.所以句子的时态应该是现在完成时,所以用have learned.
额,本人英语也不咋的,要是有错希望大家指出来,我会改的.