He______ his work, otherwise, he wouldn’t be enjoying himself by the seaside.

A．must have completed

B．should have completed

C．ought to complete

D．must complete

肾小球损害程度以内生肌酐清除率计

A．51～70ml/min为轻度损害

B．31～50ml/min为中度损害

C．＜30ml/min为重度损害

D．＜20ml/min为肾功能衰竭

E．＜10ml/min为终末期肾衰