Bob’s lectures ________ a fairly wide range and I can’t sum up what he says in a few sentences.

A．covered? B．conveyed

C．considered? D．commanded

Bob's lectures          a fairly wide range and I can't sum up what he says in a few sentences.  

    A. covered          B. conveyed         C. considered  D. commanded

Bob's lectures          a fairly wide range and I can't sum up what he says in a few sentences.  

     A.  considered          B. conveyed        C. covered        D. commanded