______ a pair of compasses, it is easy to describe a circle.
A．HavingB．To have hadC．If you haveD．If having
C
由于have的邏輯主語和it is easy to describe a circle的主語不一致，所以不能用非謂語動詞，所以用C，If引導(dǎo)的條件狀語從句。
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