Question

【题目】Grace ___ a scary movie when someone knocked at the door .

A. is watching B. will watch C. was watching

Answer 1

【答案】C

【解析】句意：格蕾丝正在看恐怖电影，突然这时有人敲门。根据句型be doing sth when sb do/did sth可知此处表示正在做某事，突然某人做了某事，根据knocked可知此处用过去的相关时态，故为过去进行时was watching，故选C。