单项选择题

She noticed the old lady's hand （） constantly during the talk.

A. shake
B. to shake
C. shaken
D. shaking

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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
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
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