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
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
B
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。