题干
.—He didn’t feel a bit nervous when ________.
—No. He’d had a lot of time ________ for it after all.
A：interviewing; to prepare
B：interviewed; to prepare
C：interviewing; preparing
D：being interviewed; preparing
答案(点此获取答案解析）
B
的圆O位于y轴左侧，且与直线x+y=0相切，则圆O的方程是（ ）