There______ many toys in his bedroom when he was a child. A. was    B. be    C. were

Dấu hiệu nhận biết thì quá khứ đơn: when he was a child (khi anh ấy còn bé)

there were + danh từ số nhiều

There were many toys in his bedroom when he was a child.

(Có nhiều đồ chơi trong phòng ngủ của anh ấy khi anh ấy còn bé.)

Chọn C