Perseverance is a kind of quality--- and that is _____ it takes to do anything well.<br />A. what <br>B. that<br>C. which <br>D. why

Perseverance is a kind of quality--- and that is _____ it takes to do anything well.
A. what
B. that
C. which
D. why

出自：国家开放大学英语语法

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