题目内容
She had to work deep into the night, ______she couldn't have spread the messages to all the relevant people successfully.
| A．while | B．but | C．otherwise | D．so |
C
解析试题分析：考查虚拟语气。句义：她不得不工作到深夜，否则的话她就不能成功地把信息传播到相关人员。把握关键词couldn't have spread，对过去的虚拟，根据前面She had to work deep into the night过去的事实，otherwise +过去的虚拟，所以C正确。
考点：考查虚拟语气
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| C．could have given | D．ought to have given |
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