was / were to have done sth.表示未曾实现的计划。
例如：We were to have told you, but you were not in.我们本来想告诉你的，但是你不在家。
根据上下文意思可以判断应该用was to have这一项。
不知道你打什麽啊！
表示一个假设，他本来是可以参加的
完整的是was to have joined in my discussion
was to 表示过去想要去干嘛
have joined 表示能参加但没有参加
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