—Why didn't you come to my party? I was so disappointed at your absence.

—I'm very sorry.I  _____ but I had a visitor at the last minute.[ ]

A. would like have    

B. would like to    

C. had planned to    

D. were going to

保安员在从事随身护卫工作时，主要采取（）措施。

A.正当防卫

B.紧急避险

C.守候伏击

D.警戒保护