Only a student or two ______ to clean the classroom after school.A、are neededB、

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问题 Only a student or two ______ to clean the classroom after school.

选项 A、are needed
B、need
C、is needed
D、needs

答案 C

解析此题考查主谓一致和谓语动词的语态，"a/an+单数名词+or two"后接单数谓语，student与动词need之间是被动关系。

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