— Who was on duty last Friday?
— . [ ]
A. I am
B. I was
C. Yes, I was
D. No, I wasn't
答案:B
Mary,along with her parents,______to Paris.
A.have moved
B.has moved
C.are moving
D.have been moving
一般来说,建筑结构的安全等级越高,其破坏产生的后果越严重,其设定时间的目标可靠指标[β]越大。