问题描述：
He___the truth.Otherwise he might have known it was Tom who had taken his place.
A.should have been told B.shouldn't have been told
C.couldn't have been told D.must have been told
答案应该选C,为什么?请说明原因,
A.should have been told B.shouldn't have been told
C.couldn't have been told D.must have been told
答案应该选C,为什么?请说明原因,
问题解答：
我来补答展开全文阅读