题干
—Jenny，how did your math exam go?
—I thought I ________，but in fact I came in the top 10% in the class.
—I thought I ________，but in fact I came in the top 10% in the class.
A：might have failed
B：couldn’t have failed
C：should have failed
D：mustn’t have failed
答案(点此获取答案解析）
A
物质的量为（ ）