问题
选择题
______ a pair of compasses, it is easy to describe a circle.
A．Having
B．To have had
C．If you have
D．If having
答案
答案：C
由于have的逻辑主语和it is easy to describe a circle的主语不一致，所以不能用非谓语动词，所以用C，If引导的条件状语从句。
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