问题详情

Leslie"s upset. She invited about 20 people to her house for a party and then no one showed up. The least they ______ have done was to call to say they ______ to go.
A．might; were going
B．could; weren"t going
C．might; weren"t supposed
D．should; were going请帮忙给出正确答案和分析，谢谢！