I ____the door before I Left my room this morning ,but I forgot. A. ought to

Question

I ____the door before I Left my room this morning ,but I forgot.
A. ought to lock B. ought to have locked
C. should lock D. could have locked
那个，答案选B

Answer 1

您好，很高兴为您解答：

I ____the door before I Left my room this morning ,but I forgot. 【B】
A. ought to lock B. ought to have locked
C. should lock D. could have locked

由最后一句“but I forgot”可知，实际上我没有做，所以句意为“我尽早离开房间前本应该锁门”

这是对过去的虚拟，用should/would/could have done形式

此处意为“本应该”，用should have done。 should=ought to 应该

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Answer 2

C. should lock

Answer 3

应该是 D