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were to have come

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were to have come
My parents ________here last night,but they couldn't.
为什么呢?我错误的选择了:must have come,为什么错?
两种表示“过去想做而未做的事”的表达方式是:
1)was / were + to have done sth,例如:
We were to have come yesterday,but we couldn’t
因为答案是要表示一个虚拟,我的父母本来应该来这里,而must是表示肯定的猜测,所以不能要