He tries hard, but he never seems able to do the work satisfactorily.
(1)
, he never seems able to do the work satisfactorily. (although)
(2)
, he never seems able to do the work satisfactorily. (as)
(3)
, he never seems able to do the work satisfactorily. (despite)
答案: 【1】Although【2】he【3】tries【4】hard
【1】Hard【2】as【3】he【4】tries
【1】Despite【2】the【3】fact【4】that【5】he【6】tries【7】hard