题目内容

My pain ___________ obvious the moment I walked into the room, for the first
man I met  asked me pitifully:" Are you feeling all right?"
A.must beB.must have been
C.could beD.could have been
B
本题是情态动词的考查。根据后半个分句可以知道谓语动词发生于过去,而情态动词+动词的完成式表示对过去的推测。
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