_______a pair of compassed,it's easy to describe a circle.A If you have B 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.

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_______a pair of compassed,it's easy to describe a circle.A If you have B 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.
_______a pair of compassed,it's easy to describe a circle.
A If you have B 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.

_______a pair of compassed,it's easy to describe a circle.A If you have B 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.
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.

如果用虚拟语气,应该是if you had 。B选项主语与having构不成主谓