问题
单项选择题
There are now______methods for studying color vision in infants than there once were.
A.more sophisticated than
B.much more sophisticated
C.much sophisticated
D.sophisticated
答案
参考答案:B
There are now______methods for studying color vision in infants than there once were.
A.more sophisticated than
B.much more sophisticated
C.much sophisticated
D.sophisticated
参考答案:B