I _____him the Christmas gift by mail because he came home during the Christmas holidays. A、ought to have sent B、couldn’t have sent C、must have sent D、needn’t have sent

I _____him the Christmas gift by mail because he came home during the Christmas holidays.
A、ought to have sent
B、couldn’t have sent
C、must have sent
D、needn’t have sent

出自：安徽理工大学-电气工程及其自动化

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