--He hasn't gone to the office up to now --well.he ____.A.ou

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--He hasn't gone to the office up to now --well.he ____.A.ought to B.ought to have

B 本应该早就到办公室,事实上没到
再问：那为什么不选A
再答：选B是因为这些情态动词特有的虚拟语气回答是推测：它应该到了，但从第一句知他根本没到，所以用ought to have ought to 不对的
再问：再问一下~为什么省掉done不把have一起省掉呢?
再答：这个就是特殊句式省略现象你讲它补充完整就是he ought to have arrived at his offfice. 前面说了ought to have 是虚拟语气所以省略动词但必须保留到have的

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