单项选择题

You were not （）very hard when I saw you in the library yesterday

A. studied 
B. study 
C. studying 
D. studies

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单项选择题
I’m exhausted; I （）too much work to do these days

A. had  
B. having
C. have  
D. am having
单项选择题
The employees （）receive more vacation days than a pay increase next year

A. used to 
B. would rather
C. would like
D. must not
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