Has everything can be done ?A. what; done　　　B. that; been doneC. that; already doneD. wh

问题补充：

Has everything can be done ?

A. what; done

B. that; been done

C. that; already done

D. what; already being done

答案：

A. what; done

(答案→)B. that; been done

C. that; already done

D. what; already being done

解析：主句是现在完成时态，主句中有一个定语从句。