问题
选择题
Great changes have taken place in that factory. It is no longer _________
it was 20 years ago,_____ it was so poorly equipped.
A．what ,when
B．that ,which
C．what ,which
D．which ,that
答案
答案：A
因为it was 20 years ago中缺少表语，所以第一空应该填what引导表语从句。第二空which引导定语从句，which代替前面整句话的意思，故答案A。