题目内容
My face ________ paleimmediately I walked into the room,for the first man I met asked me.“Are you feeling all right”?
[ ]
A.must be
B.could have been
C.must have been
D.had to be
答案:C
解析:
解析:
据句意此处为推测,“肯定、已经……”,故用must have done形式。
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