A、 might gone
B、 should gone
C、 should have gone
D、 ought have gone
答案：C
A、 might gone
B、 should gone
C、 should have gone
D、 ought have gone
答案：C
A. As
B. When
C. If
D. Although
解析：解析:因为解析:when 当……时候解析:if 如果Although 尽管
A. not to take
B. to have not taken
C. not having taken
D. he would not take
解析：解析:(Eric regretted not taking the earlier flight.)
A. make sense
B. are practical
C. makes sense
D. make senses
A. to be late
B. being late
C. that I am late
D. lateness
A. lying dead
B. lying death
C. laying dead
D. laying death
A. did we
B. didn’t we
C. dared we
D. daredn’t we
A. to get
B. her to get
C. getting
D. she would be getting
解析：解析:对某人来说是for sb.
A. have you
B. haven’t you
C. do you
D. don’t you
A. 
B. 
C. 
D. 
解析：试题解析:本题考查的知识点为交换二次积分次序.由所给二次积分可知积分区域D可以表示为1≤y≤2,y≤x≤2,交换积分次序后,D可以表示为1≤x≤2,1≤y≤x,故应选B.
