Has everything _____ can be done ______?<br />A. what; done　　<br>B. that; been done<br>C. that; already done <br>D. what; already being done

Has everything _____ can be done ______?
A. what; done　　
B. that; been done
C. that; already done
D. what; already being done

出自：国家开放大学英语语法

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