-You see my mum has promised to buy me MP4 next month. ---Oh really? But I wish I cou

问题补充：

---You see, my mum has promised to buy me MP4 next month.

---Oh, really? But I wish I could listen to musicMP3.

A. a; by

B. a; over

C. an, on

D. an; with

答案：

A. a; by

B. a; over

(答案→)C. an, on

D. an; with

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