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

She ________ (wait) for the metro for half an hour before it finally arrived

84/100

She ________ (wait) for the metro for half an hour before it finally arrived

waited

had been waiting

has waited

was waiting

Giải thích

Chọn đáp án: B