The professor explained this theory so ...

The professor explained this theory so clearly that this phenomenon was easy enough ________.

A．for us to work out	B．working out
C．for working out	D．to working out

A 【解析】考查不定式的符合结构。形容词easy后面可以使用不定式的复合结构。It is easy for sb to do sth.对某人来说做某事很容易。

考点分析：

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