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问题: why

Mary spent the whole weekend _____ in her study,_____ for the coming exams.
A locked prepared B locked preparing C locking preparing D being prepared
为何选B 不选C

解答:

spend time (in) doing sth 的用法:spend time (in) doing sth 的意思是“花费时间做某事”,在这个句型中,发出spend这个动作的主语与do这个谓语动词之间是主谓关系,例句为:
(1).I spend the whole afternoon doing my homework.
(2).Lily spends an hour exercising her spoken-English every morning.
而该题中发出spend这个动作的主语Mary与lock这个谓语动词之间不存在主谓关系(Mary并不是lock这个动作的发出者),这句话中的locked in her study表示的是一种状态,强调Mary整个周末都在学习这个状态,因此不能用locking,只能用locked.