"The lecturer was a tall thin man with white hair.""Then it（ ）Dr.Firld because he is short and fat.It Dr.Jones;he is thin."A.can’t be...must beB.couldn’t have been...might have beenC.must be...can't beD.can't have been...must have been
"The lecturer was a tall thin man with white hair.""Then it（ ）Dr.Firld because he is short and fat.It Dr.Jones;he is thin."
A.can’t be...must be
B.couldn’t have been...might have been
C.must be...can't be
D.can't have been...must have been
B.couldn’t have been...might have been
C.must be...can't be
D.can't have been...must have been
参考解析
解析：该题考查情态动词用法。根据题干可排除A，C选项（must be，can't be分别表示现在的肯/否定推测），而B选项中的might have been表示可能已经做成某事。故选D。表示对过去的否/肯定推测。
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