题干
It was clear that the small grocer was _____ people he owed money to.
A：at the expense of
B：at the risk of
C：in the way of
D：at the mercy of
答案(点此获取答案解析）
D
A：at the expense of
B：at the risk of
C：in the way of
D：at the mercy of
的图像在原点处的切线的倾斜角为 （ ）