100 câu trắc nghiệm Thì quá khứ hoàn thành tiếp diễn (Past Perfect Continuous) có đáp án

Xem toàn bộ quiz

Before the guests arrived, she ________ the house.

71/100

Before the guests arrived, she ________ the house.

cleaned

had cleaned

has cleaned

was cleaning

Giải thích

Chọn đáp án: B