【英语】Post the letter for me when you go ------the post office

问题描述:

【英语】Post the letter for me when you go ------the post office
A pass
B passed
Cpasted
Dpast
NC答案上选的D 可是为神马?

past不是动词,不能加ed
go是动词后面加介词合适(past是介词)