题目内容：

This problem requires_____ with great care.
being study
studying
填哪个 为什么?

优质解答

This problem requires studying with great care.解析：1.被动式：当一个动名词逻辑上的主语所表示的是这动作的对象时,动名词一般要用被动形式.His being neglected by the host added to his uneasiness.He couldn...