单项选择题
（）, I should not have wasted my time trying to explain matters to you.
A. I had not realized what you intended B. Had I not realized what you intended C. I had realized what you intended D. Had I realized what you intended
单项选择题 That job is quite difficult. I can understand why you have（）so many problems.
单项选择题 He will get everything ready （）three days.
单项选择题 He made a proposal that the problem （） at the meeting.
