Jack must have been joking when he said that he was going to quit his job.

Jack must have been joking when he said that he was going to quit his job.

题目
Jack must have been joking when he said that he was going to quit his job.
为什么用when用what不行吗
答案
当他说他要辞职的时候,一定是在开玩笑.
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而what he said就讲不通了.
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