Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Yesterday, when I ________ dinner, my best friend came over. A. am cook

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

Yesterday, when I ________ dinner, my best friend came over.

am cooking

was cooking

have cooked

will cook

Giải thích

Cấu trúc: When + S + V (past continuous), S + V (past simple)

=> diễn tả hành động đang xảy ra thì hành động khác xen vào

Tạm dịch: Hôm qua khi tôi đang nấu bữa tối thì bạn thân tôi ghé qua

Chọn C.