The policeman___have fined me for speeding but finally,he let me go.`为什麽用could 用should 请详解.should have fined 本应该 罚款而没罚 为什麽不对?

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The policeman___have fined me for speeding but finally,he let me go.`为什麽用could 用should 请详解.should have fined 本应该 罚款而没罚 为什麽不对?
The policeman___have fined me for speeding but finally,he let me go.`
为什麽用could 用should 请详解.should have fined 本应该 罚款而没罚 为什麽不对?

The policeman___have fined me for speeding but finally,he let me go.`为什麽用could 用should 请详解.should have fined 本应该 罚款而没罚 为什麽不对?
could have done本来可以做某事但未做.should have done一定要.