I hoped diligence could make up for lack of preparation. On weekend nights, when my American roommates were out on dates, I would stay in the library reading the I visited the writing tutor for every paper I turned in. My papers were always written days before they were due. I lingered after classes to question professors. My classmates lent me their notes so I could learn the skill of note-taking in English. 
 Q: How did the writer develop her paragraph?
A、with cause-and-effect pattern
B、with comparison and contrast
C、with examples
D、with problem-and-result pattern