问题补充：
However difficult you find to arrange your time, it will pay off in the long run.
A. this
B. one
C. it
D. that
答案：
A. this
B. one
(答案→)C. it
D. that
解析：考查让步状语从句和it做形式宾语：句意：无论你发现安排时间有多难，从长远角度看它会有回报的。这是让步状语从句，还原成简单的句式是：you finddifficult to arrange your time.这样可以看出是it做形式宾语的句子，find it+adj+to do，选C。
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