—Alice, how’s your grandpa?
—He’s fine. He used to _______ TV after dinner, but now he is used to _______ for a walk.
A. watch; go
B. watching; go
C. watching; going
D. watch; going
【答案】D
【解析】句意:——爱丽丝,你的祖父怎么样?——他很好。他过去常常在晚饭后看电视,但是现在他习惯散步。used to do sth过去常常做某事,故第一空用动词原形watch。be used to doing sth习惯做某事,故第二空用动名词going。故选D。