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we have been looking for the boy all the morning but he is n

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we have been looking for the boy all the morning but he is nowhere__
a.to see b.seeing c.seen d.to be seen
选择D(出自五高考三年模拟 专题6 动词的时态和语态)
Be to +动词原形 意思是 按计划或安排要做的事
还有8种意思
这是第6种 表示“可以,可能”相当于may ,can
eg:
The news is to be found in the evening paper.
She is nowhere to be found.在哪里也找不到她