— Mum it’s none of my business. Why I care? — Just because she is your sister. A. can B

问题补充：

— Mum, it’s none of my business. Why I care?

— Just because she is your sister.

A. can

B. should

C. will

D. may

答案：

A. can

(答案→)B. should

C. will

D. may

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