题目

—Why does Sara know so much about Angkor Wat?   —She _____ have been there, or…   A. must       B. oughtn’t to      C. may       D. can’t 答案：CThe roads into London were so _____ traffic that even the fire engines couldn’t get through.A.choked up byB.choked up withC.choked back byD.choked back with