三题文法题 请高手帮忙 谢谢
(C) You shouldn't tell lies, ____ take advantage of people.
A. and you should neither
B. neither should you
C. nor should you
D. or you should
为什么不能选A和B
(D) Who is the girl ___ by the door? She is really a stunning beauty.
A. set
B. sits
C. sat
D. seated
为什么不能选B和C
(C) Look at the way that couple _____ to each other. They must have been in love for a long time.
A. talked
B. have talked
C. are talking
D. will talk
为什么不能选A和B 如果有talk这个选项的话,可以选吗?