PHẦN 3: ĐỀ ÔN LUYỆN THI PRACTICE TEST 9

Our landlord………….more helpful during our stay. A. mustn’t have been B. had to be C. will have been D. couldn’t have been

16/72

Our landlord………….more helpful during our stay.

mustn’t have been

had to be

will have been

couldn’t have been

Giải thích

Chọn D