问题
选择题
Dr Yuan Longping grows ________ is called super hybrid rice, _________ has a high output.
A．what; which
B．that; what
C．that; which
D．what; what
答案
答案：A
本题考查定语从句和宾语从句。第一个空是宾语从句，引导词作主语用what；第二空是非限制性定语从句，引导词代表super hybrid rice，在从句中作主语，用which。