Let's invite your parents _________ the party.[ ]
A. to
B. in
答案：A
Lisa is going to clean her _______ room when she _________ back from school next weekend.
A．living; is coming
B．living; comes
C．live; come
D．lives; is going to come
已知一元二次方程x2+px+q=0的两根是-1和2，则抛物线y=x2+px+q的顶点坐标是______．
