问题
选择题
_____ is known to us all is that to work hard to achieve a goal is more important than only to have a goal.
A．What
B．As
C．it
D．This
答案
答案：A
考查名词性从句。设空这句话之一个主语从句，从句中缺少主语，所以用关系词what，故选A。
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