单项选择题

No matter how hard he worked,()

A. he could not do any better
B. and he could not do any better
C. so he could not do any better
D. but he could not do any better

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In general, the amount that a student spends for housing should be held to one-fifth of the total()for living expenses

A. acceptable   
B. available     
C. advisable    
D. applicable
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I'd appreciate () these letters.

A. you to mail     
B. you mail   
C. your mailing    
D. you would mail
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