It's near 7 o'clock. He ____be here at any moment.应该填should

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It's near 7 o'clock. He ____be here at any moment.应该填should 还是could?

should
基于It's near 7 o'clock 的推断
都快七点了,现在他应该随时都可能到.
下面是参见章振邦《新编英语语法》的例句和说明
should/ought to 两个情态动词表推断时接近于must,仅是弱化了must的肯定含义,作“应该."讲比较：
Tom must be home by now.用must,断定已经到家.
Tom should/ought to be home by now.意为.该到家了,但是否已到不能肯定,也许因故耽搁也说不定

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