no one but tom and mary ___ there then. is was were be 应该是哪个呢?

并解释一下,拜托了

No one but tom and mary ___ there then.
A.is B.was C.were D.be
答案与解析:
B.was 根据句意:除了汤姆和玛丽,那时候没人在那儿,可知句子是一般过去时,据此排除A、D两项。在No one but...句式中,谓语动词与No one保持一致,因此选B。
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第1个回答  2011-11-28
were
第2个回答  2011-11-28
was