四大洋七大洲，最大的洲和最大洋是[ ]

A、非洲、太平洋　　　　　

B、北美洲、大西洋　

C、亚洲、太平洋　　　　　　　　　

D、欧洲、印度洋

— Has the doctor arrived yet?

— No, she _____ an hour ago. [ ]

A. has to come

B. ought to have come 

C. should come

D. used to come