He claims to be an expert in astronomy, but in actual fact he is quite ignorant on the subject.      he knows about it is out of date and inaccurate.

    A. What little                   B. Too little                     C. How much                  D. Very little

He       to be an expert in astronomy, but in actual fact he is quite ignorant on the subject.

        he knows about it is out of date and inaccurate.

A．proves; So little                            B．concludes; How little

C．claims; What little                D．is evaluated; Such little