单选题 It was very difficult to build a power station in the deep valley, but it ______ as we had hoped.

【正确答案】 A

【答案解析】come off成功，奏效；go off爆炸，离去；bring out带出，引导出；make out分辨出，辨认出。该句中power station意为“能量站、电站”；valley意为“河谷、山谷”。