____ you think he ____back by dinner time?选项A为Do; have come 是错误的;但我们老师讲若have改成be就正确,为什么?

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____ you think he ____back by dinner time?选项A为Do; have come 是错误的;但我们老师讲若have改成be就正确,为什么?
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____ you think he ____back by dinner time?选项A为Do; have come 是错误的;但我们老师讲若have改成be就正确,为什么?
____ you think he ____back by dinner time?
选项A为Do; have come 是错误的;
但我们老师讲若have改成be就正确,为什么?

____ you think he ____back by dinner time?选项A为Do; have come 是错误的;但我们老师讲若have改成be就正确,为什么?
要改成will be吧.1,Have本来就不能用在第三人称.2.时态不对.Have come是现在完成时 will be是将来时