He (will not do) it (had he known) how (serious) the outcome (would be).

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问题 He (will not do) it (had he known) how (serious) the outcome (would be).

选项 A、will not do
B、had he known
C、serious
D、would be

答案A

解析 应改为would not have done。综合全句看,这是表示对过去情况的虚拟假设,固定用法:would not have done...if had done...,此处had he known为if he had done的倒装省略。
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