試題詳解

試卷：無年度 - 100年英文精選題庫1#4032 | 科目：高普考/三四等/高員級◆英文

試卷名稱：無年度 - 100年英文精選題庫1#4032

科目：高普考/三四等/高員級◆英文

All that can be done ______.
(A) has been done
(B) have been done
(C) has been doing
(D) have been doing

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