答案：C
統計：A:4,B:5,C:61,D:13,E:0
難度：簡單
【吃貨】評論
9. In case of power outage, the garage door must be opened _____ by pulling the chain with hands.
【bbbbfis】評論
power outage停電
【黃】評論
In case of power outage, the garage door must be opened ___ __ by pulling the chain with hands.