They decorated the tree with colorful Christmas balls.

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The tree was decorated with colorful Christmas balls.

Colorful Christmas balls had been decorated under the tree.

The tree had decorated with colorful Christmas balls.

They had decorated colorful Christmas balls and the tree.

Giải thích

Đáp án đúng: A

Câu bị động quá khứ đơn. Cấu trúc: S + was/were + V3/ed

Dịch nghĩa: Cây thông được trang trí bằng những quả châu Giáng sinh nhiều màu sắc.