题干
.
If we ________ earlier, we would have had trouble getting good seats.
If we ________ earlier, we would have had trouble getting good seats.
A：didn’t arrive
B：haven’t arrived
C：hadn’t arrived
D：couldn’t arrive
答案(点此获取答案解析）
C
在一个周期内的图象如图，此函数的解析式为 （ ）