Peter works ____(hard)at all his subject.另:subject 的介词好像是in吧.到底是in subject 还是at subject啊!我记得介词是at,但是网上又说是in.

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Peterworks____(hard)atallhissubject.另:subject的介词好像是in吧.到底是insubject还是atsubject啊!我记得介词是at,但是网上又说是in.P

Peter works ____(hard)at all his subject.另:subject 的介词好像是in吧.到底是in subject 还是at subject啊!我记得介词是at,但是网上又说是in.
Peter works ____(hard)at all his subject.
另:subject 的介词好像是in吧.
到底是in subject 还是at subject啊!
我记得介词是at,但是网上又说是in.

Peter works ____(hard)at all his subject.另:subject 的介词好像是in吧.到底是in subject 还是at subject啊!我记得介词是at,但是网上又说是in.
hard
at all his subjects

hard.subject n.科目
peter对所有的科目都很努力