题干
I saw him in the library yesterday. He a book at that moment.
A：reads
B：is reading
C：was reading
D：will read
答案(点此获取答案解析）
C
I saw him in the library yesterday. He a book at that moment.
A：reads
B：is reading
C：was reading
D：will read
”和“
”分别表示两种元素的原子，能用该图表示的化学反应是（ ）