Nobody but Thomas and Johnson ______ in the laboratory yesterday.

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问题 Nobody but Thomas and Johnson ______ in the laboratory yesterday.

选项 A、are
B、were
C、was
D、has been

答案C

解析 句中的真正主语为nobody,为第三人称单数,Thomas与Johnson均作介词but的宾语。注意:主谓一致有条原则:主语是单数就用单数动词,不考虑其他成分,如由 but,except等引导的名词。
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