题干
— What do you suppose ______ her look so upset?
—______ by her boyfriend again.
—______ by her boyfriend again.
A：making ; Misunderstood
B：had made ; Being misunderstood
C：made ; Having been misunderstood
D：has made ; Misunderstood
答案(点此获取答案解析）
C
在圆
上绕坐标原点沿逆时针方向匀速旋转，12秒旋转一周，已知时间
时，点A的坐标是
，则当
时，动点A的纵坐标y关于t（单位：秒）的函数的单调递减区间是
