问题
选择题
____ is known to all, persistence is a kind of quality and that’s ____ it takes to do anything well.
A．As; which
B．It; which
C．It; what
D．As; what
答案
答案：D
句意：众所周知，坚持不懈是一种品质，是我们做任何事都需要的品质。as is known to all, 众所周知，相当于 It is known to all that.... what引导表语从句，做take的逻辑宾语。which在从句中的意思是哪一个。由句意可知选D。
考点: 考查代词的用法。