题干
He said to me with an _________ look on his face.
A：excite
B：exciting
C：excitement
D：excited
答案(点此获取答案解析）
D
A：excite
B：exciting
C：excitement
D：excited
分别表示不同元素的原子），下列对图示反应的理解中，正确的是 （ ） 