17.A.amB.isC.areD.isn’t
17.
A.am
B.is
C.are
D.isn’t
相关考题:
Which of the following words in bold is pronounced with a falling tone?A.Have you finished your homework?B.Are you a student or a teacher?C.What's your first name?D.Isn't it beautiful?
下列型号的离心泵中,不属于水泵的是()。A.Y型B.IS型C.D型D.Sh型