--The man in a black suit _______ be our youth worker.
-- I’m sure it _____ be him. I saw him in the laboratory building some minutes ago.            
A．must; can’tB．can; mustn’t C．can; couldD．must; won’t
A

試題分析：句意：那個穿黑色禮服的人一定是我們的青年工人。我確信他不是。我?guī)追昼娗霸趯嶒灅抢锟匆娝�。第一個空是一種語氣比較肯定的推測，而can’t表示“不可能”，根據(jù)后面的I saw him in the laboratory building some minutes ago.可以看出，他在實驗室里有可能是科技人員；故選A。
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