精品一区二区免费在线观看_国产精品久久久久久av福利软件_97成人精品区在线播放_国内成人精品一区

The factory produces half a million pairs of shoes every year, 80% _______ are sold abroad.

A. of which ?

B. which of ?

C. of them ?

D. of that?

 The factory produces half a million pairs of shoes every year,80%________ are sold abroad.     

A.  of them                B. which of                        C. of which                          D. of that