Helen was painting a picture when her mum was cooking

Câu hỏi :

Helen was paintingpicture when her mum was cooking

A. was painting

B. picture

C. when

D. was cooking

* Đáp án

* Hướng dẫn giải

Đáp án đúng: C

When=> While

Helen đang tô màu cho một bức tranh khi mà mẹ cô ấy đang nấu ăn.

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