【题目】Amy and Sarah _________________ now. ( )
A.are do their homework
B.is doing their homework
C.are doing their homework
【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。
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