Such electron tubes -------- in a radio set are also found i

31.Such electron tubes ________ in a radio set are also found in a TV set.
A.that we use B.as we use C.as we use them D.that we use them
为什么选B不选A.as 跟that的用法有什么不同?
先行词被such,as ,the same 修饰时,定语从句的关系代词用as引导.
32.I hate to see papers _______ in pencil.
A.writing B.to write C.written D.write
如果是被写怎么没有be呢?
注意see后接复合宾语的搭配：see sb/sth done/doing/do
所以不用be,written在句中作宾补表被动.papers是被用铅笔写的.
34.This is the second time she ______ improvement on that equipment.
A.had made B.made C.is making D.has made
为什么选D?
这是固定句型：this/it is the first/second/third...time+that-从句,意思是：第几次干某事.
在从句中要求用现在完成时.所以选D.
35.._______determines a good meal varies from country to country.
A.What B.That C.It D.Which
A/B/C选项怎么区分啊?
选A.这是what引导主语从句.what引导主语从句并且在从句中作主语.
that引导主语从句时,在从句中不做成分.有动词determines看出这个从句缺少主语.
it一般在句中做形式主语时,后面还需要连词引导的从句.
如：It is well known that China has a long history.
36.Arabic is a language I found ________ to learn.
a.it difficult b.that difficult c.difficult it d.difficult
答案选A.
it在从句中做形式宾语,difficult在从句中宾补.to learn在从句中做真正的宾语.
19.The fact ________ shows that he was never really serious about coming.
a.that he didn’t turn up b.which he didn’t turn up
c.he didn’t turn up d.for him not to turn up
为什么选A?
fact后面接that引导的同位语从句,同位语从句说明fact的内容.
20.________,he’ll make a first-class tennis player.
a.Giving time b.To give time
c.Given time d.Being given time
为什么选C?
过去分词given time在句中做状语.过去分词做状语表被动,也就是主语he是given的承受着.翻译：如果他被给予时间（假以时日）,他会成为一个一流的网球运动员的.
Professor Black had us ________ compositions every Friday.
a.to write b.written
c.write d.writing
为什么选C?
have sb do 意思是让/使某人做某事.动词原形do作宾补.
所以选write.
再问： 那怎么区分主语从句和同位语从句呢？
再答： 主语从句多放在句首。同位语从句往往跟在下列名词后面：fact,news, idea,question,word(消息),是用来说明所修饰的名词的内容。 如:What he said is quite right.(主语从句) The news that our team won the game is true.（同位语从句）