Question

I have always regretted ______ harder at school.

A．not to study	B．to not study
C．having not studied	D．not having studied

Answer 1

D

试题分析：考察动词regret用法。动词regret后面要接两个结构，regret to do sth遗憾要做某事；regret doing sth="regret" having done sth遗憾做了某事；句意：我总是后悔在学校里没有认真学校。动名词的否定式就是在动名词前面直接加not。故D正确。
点评：要注意动词regret后面可以接两个不同的结构，而且意义完全不一样，，regret to do sth遗憾要做某事；regret doing sth="regret" having done sth遗憾做了某事；同样用法的动词还有forget等，在平时要多加识记。