There______ a small garden behind his house 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 was + danh từ số ít

There was a small garden behind his house when he was a child.

(Có một khu vườn nhỏ phía sau nhà của anh ấy khi anh ấy còn bé.)

Chọn A