单选题
39.
Tom has been most helpful to us; in fact I don't know what we ______ without him.
A、
have done
B、
will have done
C、
had done
D、
would have done
【正确答案】
D
【答案解析】
本题考查的是without引导的虚拟语气的用法，是一种与事实相反的表述。
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