英语语法,HELP

题目

英语语法,HELP
32.He is very rich,so he ______.
A.must make a fortune B.should have made a fortune
C.must have made a fortune D.should make a fortune
33.______,she failed again in the test and felt very depressed.
A.As she worked hard B.Hard as she worked
C.Since she worked hard D.Hard since she worked
34.I’m going to get my letters ______tomorrow afternoon if I can get them ready today.
A.type B.to type C.typed D.typing
请分别解释下为什么,

答案

must 是肯定的猜测、 must have done 是对过去肯定的猜测.
选择C.
AS的让步状语从句.Hard as she worked.选择B
get sth done.把什么做了.
get sth to do 让别把什么做了.
get sth doing 是让别人正在做.
选择C.