Question

  As we all know, Jack is experienced _____ the problem of this kind.

A．to work out

B．at working

C．at working out

D．for working out

Answer 1

C

考查短语be experienced at在某方面有经验。At是介词后面接名词或者动名词。句意：众所周知，杰克在解决这方面的的难题上有经验。Work out解决，算出，故选A。