Jim gave me a letter to post,I…forget to post it.A mustn'tB shouldC could E must

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Jim gave me a letter to post,I…forget to post it.A mustn'tB shouldC could E must

Jim gave me a letter to post,I…forget to post it.A mustn'tB shouldC could E must
Jim gave me a letter to post,I…forget to post it.
A mustn't
B should
C could
E must

Jim gave me a letter to post,I…forget to post it.A mustn'tB shouldC could E must
选项没打全吧?应该是couldn't