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Bob would have helped us yesterday ,but he .
A.was busy busy
B.is busy
C.had been busy
D.will be busy
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A. important B. interesting C. simple D. surprising
Why can’t the man concentrate on his study?
A. He keeps thinking of going to the movies. B. His classmates are taking a break.
C. He’s been studying for too long.
A．news
B．love
C．humorous
D．adventure
人可以避免“青蛙效应”在于能居安思危，并因“思所以危”而“安”，其哲学道理是
①认识“危”的条件、根源和前景是实现“安”的必要前提
②认识“危”的必然性，则可以安之若素、泰然处之
③认识“安”与“危”的依存、贯通关系，顺应和迎接安危转化的趋势
④认识“安”与“危”的包含、转化关系，努力实现转危为安的趋安避危
A．①②B.②③C.③④D.①④
When was duet most probably found to be the very hero? ( )
A. the day when he was leaving for home.
B. a couple of days after the girl was rescued
C. the first day when he was in New York
D. the same day when he was interviewed.