While Charlie Puth ……….the rose bush in the back yard, the phone rang.

Câu hỏi :

While Charlie Puth ……….the rose bush in the back yard, the phone rang.

A had been watering

B watering

C watered                    

D was watering

* Đáp án

D

* Hướng dẫn giải

Phương pháp giải:

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