No one really knows for sure makes a person bee right-handed rather than left-handed.
A. whatever
B. who
C. what
D. whoever
网友回答
A. whatever
B. who
(答案→)C. what
D. whoever
解析:句意:没有人确切的知道什么使人们用右手而不是左手。这里know后面接的是宾语从句,宾语从句中缺少主语,用what连接宾语从句,whatever“凡是…的东西”,who“谁”,whoever“凡是…的人”,选C。