1—Robert is indeed a wise man.
—Oh，yes.How often I have regretted ______ his advice!
A．to take B．taking C．not to take D．not taking
解析：regret doing sth.“后悔做过某事”；regret to do sth.“抱歉要做某事”。由题干可知，要用D项表示“对没接受建议而感到后悔”。
答案：D
2The children talked so loudly at dinner table that I had to struggle ______.
A．to be heard B．to have been heard C．hearing D．being heard
解析：句意：孩子们在进餐时说话声音如此之大，以至于我不得不尽力提高嗓门好让别人听见我的话。struggle to do sth.“努力做某事”，因句中I与hear之间是被动关系，故用不定式的被动形式。
答案：A
