竖向投测只可用经纬仪进行投测。( )
参考答案：错
He admitted ______ his best friend , Jack, _______to make up for that.
A．betraying , determining
B．betraying , determined
C．to betray , determining
D．to betray , determined
— Do you have any plans for this weekend?
— I'm not sure. I _____ go climbing Mount Yuntai. [ ]
A. must
B. need
C. may
D. can
is weekend?