天晚了,我必须回家了.It‘s getting late and I ____ ____ go home.
天晚了,我必须回家了.It‘s getting late and I ____ ____ go home.
天晚了,我必须回家了.It‘s getting late and I ____ ____ go home.Dr Green performed an operation on Mary two hours ago.Dr Green ____ ____ on Mary two hours ago.(同义表达方式)