5000 câu trắc nghiệm Tiếng Anh 9 có đáp án - Phần 46
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_____ Mrs. Richards was entering the dining-room, there was a knock on the front door.

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_____ Mrs. Richards was entering the dining-room, there was a knock on the front door.

At the very moment

So long as

Only when

During the time

Giải thích

Chọn đáp án A