She had to work deep into the night, ______she couldn't have spread the messages to all the relevant people successfully.
A．whileB．butC．otherwiseD．so
C

試題分析：考查虛擬語氣。句義：她不得不工作到深夜，否則的話她就不能成功地把信息傳播到相關(guān)人員。把握關(guān)鍵詞couldn't have spread，對(duì)過去的虛擬，根據(jù)前面She had to work deep into the night過去的事實(shí)，otherwise +過去的虛擬，所以C正確。
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