I can(not) imagine that they could (not) finish it in such a short time

I can(not) imagine that they could (not) finish it in such a short time

题目
I can(not) imagine that they could (not) finish it in such a short time
上面句子中的not 应该放在can后面还是could后面为什么?
答案
oberviously,the word "not" should be insert the back of imagine!
这种从句很常见!
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