Question

【题目】Amy and Sarah _________________ now. ( )

A.are do their homework

B.is doing their homework

C.are doing their homework

Answer 1

【答案】C

【解析】

句意：艾米和莎拉正在做作业。这是考查了现在进行时，主语+be+ving，主语是复数，系词用are，做作业do one’s homework.do的现在分词doing，故选C。