CHỌN PH-ƠNG ÁN THÍCH HỢP ĐỂ HOÀN THÀNH CÂU SAU . I WAS LEARNIN...

Câu 15 Chọn ph-ơng án thích hợp để hoàn thành câu sau .

I was learning maths when ...

A. my mother comes back

B. my mother came back

C. my mother has come back

D. my mother is coming back