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

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The employees （）receive more vacation days than a pay increase next year

A. used to 
B. would rather
C. would like
D. must not
单项选择题
Have you （）had a part-time job

A. ever  
B. since  
C. before 
D. ago
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