1.When I try to find out ______that prevents so many people

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1.When I try to find out ______that prevents so many people from taking part in the program,it seems to me that there are two main causes.
A.what it is B.what it does C.why it does D.why it is
2.I'd appreciate_______you could give me some advice.
A.it B.that C.it if D.when
3.I hate it ________people speak with their mouths full.
A.if B.when C.because D.for
4.It was twelve o'clock _______they finished the work.
A.when B.at which C.that D.since
A,B,A,尤其是第二题it是不是做形式宾语,如果选that,那句子要怎么变化呢?第三题为什么不选because和for（for也不是有因为的意思吗?）第四题为什么不选at which?

1.A.强调句 what it is that prevents...可转化成 it is what that prevents...
2.C.固定用法,虚拟语气
3.B.我不喜欢人们吃饭时说话.用because 和 for 都有表原因的意思.但是这里是时间状语从句.当人们吃饭时说话的时候...
4.A.具体时间接时间状语从句.用when.如果用B,应该是at which time

1.When I try to find out ______that prevents so many people I try to understand ------that prevents so many people from when I try to understand___it is that prevents so many When I try to understand —— that prevents so many Americans When I try to understand __________that prevents children fr When I was trying to find out 1____1_ that prevented so many many people like to when they find something i Many people are surprised when they find out the internetwas I want to say,the singer is not so good when,some people try I try to understand _____ that prevents Mary from attending i just don't understand___that prevents so many Amerians fro I just don’t understand_______ that prevents so many America