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Bob would have helped us yesterday, but he __________ A、was busy B、is busy C、had been busy D、will be busy
网校学员微信用**在学习英语零基础直达大学六级全能畅学卡【现金奖励班】时提出了此问题，已有1人帮助了TA。
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清醒季smile
同学你好，该知识点来自沪江网校《英语零基础直达大学六级全能畅学卡【现金奖励班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。
同学你好~昨天能帮的，但是昨天在忙，所以没有帮忙，只用一般过去时就可以了。
这里已经有明确的时间状语yesterday了，就是昨天忙，所以昨天没有帮忙。
并不存在过去的过去。
祝同学学习进步~
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英语零基础直达大学六级全能畅学卡【现金奖励班】
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