问题不在于on, 而在于agree这个动词在表示下面这个词义时,英国英语还可以是及物动词,所以直接后接名词作宾语,而不是介词on的省略。如《美国韦氏词典》:
agree:
3:of two or more people or groups : to decide to accept something after discussing what should or might be done
[no object]
— usually + on or upon
The jurors were unable to agree on a verdict. [=to reach a verdict]
[+ object]
(Brit)
The jurors were unable to agree a verdict.
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