A、 have written
B、 are written
C、 were written
D、 have been written
答案：D
A、 have written
B、 are written
C、 were written
D、 have been written
答案：D
A. in
B. with
C. on
D. for
A. Bob
B. Bobs
C. Bob＇s
D. Bobs＇
A. should speak
B. spoke
C. should have spoken
D. speak
A. turned down
B. turned on
C. turned off
D. turned out
解析：解析:turn down 拒绝解析:turn on 打开。turn on the light 开灯解析:turn off 关上。turn off the light解析:turn out 证明为……
A. might gone
B. should gone
C. should have gone
D. ought have gone
A. make sense
B. are practical
C. makes sense
D. make senses
解析：解析:本题考查的知识点为二次积分的计算.由相应的二重积分的几何意义可知,所给二次积分的值等于长为1,宽为2的矩形的面积值,故为2.或由二次积分计算可知
A. at
B. in
C. from
D. out of
A. whose else can it be
B. whose else’s can it be
C. who’s else can it be
D. who else can it be
