单选题 The employee was ______ excited about his new job that he vowed to work even harder to live up to the boss's expectations.

(A) quite
(B) very
(C) extremely
(D) so

【正确答案】 D

【答案解析】[理由] 本句测试下列固定结构：
so+形容词/副词+that从句
如此地……以致于……
such+名词+that从句
如此的……以致于……
根据上述，原句空格后有that引导的从句，得知空格内应置so或such，但空格后有形容词excited(兴奋的)，故得知空格应置so，故仅(D)为正选。