We were given ________ great surprise when he said he would leave ________ office soon.
A.不填; theB.不填;不填C.a; 不填D.the; the在线课程C
解析：
surprise在表示“惊讶”时，为抽象名词，而当表“令人惊讶的人或事”时，则为可数名词．leave office为固定结构，表示“离职”的意思．