作者tw00176060 (Andy)
看板Eng-Class
标题[文法] 一题文法题^^
时间Tue May 4 19:04:40 2010
Our ancestors ___ remarkable people to have lived with such harships.
(A) could have been
(B) must have been
(C) should be
(D) will be
答案:(B)
请问为何其他三个答案不能选?
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