—Whydidn'tyoucometoMike'sbirthdaypartyyesterday?—Well，I...

问题详情：

—Why didn't you come to Mike's birthday party yesterday?

—Well，I________but I forgot it.

A．should                       B．must

C．should have                  D．must have

【回答】

C

知识点：虚拟语气与情态动词

题型：选择题