题干
Tom is one of _________ students in my class .
Yes . He usually prefers _________ at home to playing outside .
A：the most hard-working , studying
B：more hard-working , to study
C：the most hard-working , to study
D：more hard-working , studying
答案(点此获取答案解析）
A
，
），则点M的极坐标为（ ）