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My sister was making a cake while my brothers were putting on the decorations for the party.

was making

while

were putting on

decorations

Giải thích

Hướng dẫn giải:

Đáp án đúng: C

- Cấu trúc: S1 + was/were V-ing while S2 + was/ were V-ing => để diễn tả hai hành động xảy ra đồng thời trong quá khứ.

- Cụm động từ:

+ put on: mặc vào (quần áo)

+ put up: treo lên/ nâng lên

Dịch nghĩa: My sister was making a cake while my brothers were putting up the decorations for the party. (Em gái tôi đang làm bánh trong khi anh em tôi đang trang trí cho bữa tiệc.)