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The teacher and writer_____explaning the story yesterday>

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The teacher and writer_____explaning the story yesterday>
选择A.is B.was C.are D.were哪一个,麻烦分析一下.
怎么才能知道是老师兼作家呢?
The teacher and writer_____explaning the story yesterday>
是选B
老师和作家是一个人,所以用单数
如果是老师和作家,应该是the teacher and the writer,那就应该用复数were了.