因为不定式一般表示具体的、一次性的、将来的动作.
这里,泛指他是开门专家.不是开某种门,或者某个门.开门专家应该是开各种门的行家.
动名词 -ING就表示泛指的、一般的动作
类似：I love reading. 热爱读各种东西、各种形式的阅读
Rex soon became an expert at opening the gate,at后可以用不定式吗?为什么
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