语法与词汇 The plants would have grown all right if she ____ them properly.

【正确答案】 A

【答案解析】[解析] 本题考查虚拟语气的用法。从句为would have done，表示该句是与过去事实相反。与过去事实相反的虚拟语气，主句应用过去完成时，即had done。故选A。