Question

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

Answer 1

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。

Answer 2

were

Answer 3

was