Tom made great progress last semester and as result he was praised by the teacher.A. a;

问题补充：

Tom made great progress last semester and as result, he was praised by the teacher.

A. a; a

B. a; /

C. /; /

D. /; a

答案：

A. a; a

B. a; /

C. /; /

(答案→)D. /; a

解析：考查冠词。第一空后的名称progress是一个不可数名词，前面不能有a修饰；第二空是固定词组as a result结果；句意：Tom上个学期取得了巨大的进步，结果他被老师表扬了。故D正确。