Chinesescientistshaveproducedanembryoofagiantpandathrou...

問題詳情：

Chinese scientists have produced an embryo of a giant panda through cloning technology,_____ is a breakthrough ______ could save the endangered animals.

   A. that; which   B. which; that     C. which; what    D. that; what

【回答】

B

知識點：定語從句

題型：選擇題