题目

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 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。

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