67.My roommate didn't meet the deadline. I regretted_____.
答案解析
解析：
regret to do sth. 意为“遗憾要去做某事”,其否定形式是 regret not to do sth. regret doing sth.意为“后悔做过某事”,,其否定形式是regret not doing sth.。根据句意可知,这里应用动名词形式。此处 being unable to help 相当于 not being able to help。故选C。
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