______ of them are doing homework at home.

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问题 ______ of them are doing homework at home.

选项 A、Each
B、Both
C、Every

答案B

解析选项A“Each of them”后面谓语动词应为单数。选项C“Every”后面应加单数可数名词。这两个选项均可排除。只有选项B“Both”表示“两者都”，后面be动词用复数，符合题意，故选B。

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