_______a pair of compassed,it's easy to describe a circle.
问题描述：
_______a pair of compassed,it's easy to describe a circle.
A If you haveB having
答案是A 为什么B不可以啊
还有 A 不是要跟虚拟语气么?即it would be easy to describe a circle.
答
很有可能的事不必用虚拟语气
用非谓语动词,其逻辑主语要和主句主语一致.