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问题 选择题

—Who is it?

— ______.  I took this photo when I was 4.[ ]

A. I

B. Me

C. Mine     

D. Myself

答案

答案：B

选择题
当a、b∈R时，不等式
|a+b|
|a|+|b|
≤1成立的充要条件是（　　）
A．ab＜0B．ab＞0C．a2+b2≠0D．ab≠0
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选择题

— Hi, Vera, have you checked the account yet?

— Certainly, I ______ it five times even though you told me to do it twice.[ ]

A. checked    

B. will have checked    

C. have been checking    

D. had checked
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