单项选择题
（）his advice, I couldn't have completed the project successfully
A. As if B. Should C. But for D. Had
单项选择题 （）health insurance, it will be much too expensive to have the surgery
单项选择题 It （）so cloudy and humid, you ought to carry an umbrella with you
单项选择题 This is definitely the city （）I'd like to live for the rest of my life
