Question

 (2011年黃岡檢測)Beijing was attacked by such a terrible sandstorm________few residents had ever experienced before.

A．a(chǎn)s                                B．which

C．a(chǎn)nd it was                    D．that

Answer 1

解析：選A�？疾槎ㄕZ從句。as在此處為關(guān)系代詞，作experienced的定語。