单项选择题

By the end of this year, they （） a new program in Europe.

A.had started    
B.start          
C.are starting    
D.will have started

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单项选择题
Before we moved to America, we （） in Australia for ten years.

A. lived
B. living
C. had lived
D. have lived
单项选择题
He must be in the building because he was seen（）the building just now.

A. entering
B. enter
C. to enter
D. having entered
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