It was_________great shock to the world that two aero-planes crashed into______World Trade Center in New York o September 11th, 2001. A. a; / B. a; the C. the; the D. /; the
答案:B 解析: shock指代具体事情时为可数名词,a great shock意为“一次沉重的打击”;由普通名词构成的建筑类专有名词需加冠词,故答案为B。