一个四棱锥和一个三棱锥恰好可以拼接成一个三棱柱.这个四棱锥的底面为正方形,且底面边长与各侧棱长相等,这个三棱锥的底面边长与各侧棱长也都相等.设四棱锥、三棱锥、三棱柱的高分别为,,,则( )
Tom ____ have kept his word. I wonder why he changed his mind. A. must B. should C. need D would
---- Does your wife like tea? ---- Well, she doesn’t really ____ tea; she likes coffee better.
The film TITANIC ____ a true story.
Hurry up! The train _____. You know it______ at 8:30 am.
Mr. Smith insisted that his book _______within three days.