500 Câu trắc nghiệm tổng hợp ngữ pháp Tiếng Anh thi THPT Quốc gia (Phần 3)

While Peter ___________ the rose bush in the back yard, the phone rang

25/25

While Peter ___________ the rose bush in the back yard, the phone rang.

were watering

has watered

watered

was watering

Giải thích

Chọn D