Mark the letter A,B,C or D on your answer sheet to indicate the correct ansuer to each of the following questions. When she looked out of her window, the birds ________.

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Mark the letter A,B,C or D on your answer sheet to indicate the correct ansuer to each of the following questions.

When she looked out of her window, the birds ________.

sang

had sung

were singing

was singing

Giải thích

Hướng dẫn giải:

Đáp án đúng: C

When + S + V(quá khứ đơn), S + V(quá khứ tiếp diễn)

Hướng dẫn dịch: Khi cô ấy nhìn ra ngoài cửa sổ, đàn chim đang hót.