When he was opening the door, he was ___________ that he was being followed by a policeman.
A．consciousB．casualC．carefulD．doubtful
A
詞義辨析. A.意識到的;自覺的 B.隨便的;臨時的 C.認真的    D. 可疑的.句意:當他打開門,他意識到他被一個警察跟著.選A.
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