---- We've only got this small bookcase. Will that do?
---- No, _ _ I am looking for is something much bigger and stronger.
A. who
B. that
C. what
D. which
网友回答
A. who
B. that
(答案→)C. what
D. which
解析：本题考查名词性从句里的主语从句，根据look for sth.可以判断出该句子是缺少宾语的，that 在名词性从句中不充当成分和意义，what 即可以充当主语，也可以充当宾语，句意：--我们只是得到这个小书柜，那行吗？--不，我想找的是更大的更牢固的。所以答案为 C。