问题
选择题
There is no doubt, in my opinion,_______ matters is not the speed, but the quality of the product.
A．what what
B．that that
C．that if
D．that what
答案
D
that引导一个同位语从句，在这个同位语从句中又有一个主语从句：what matters。句意：依我看，毫无疑问，重要的不是速度，而是产品的质量。