Not only Tom but also Jim ______ the Great Wall twice. [ ]

A. has been to

B. has gone to

C. have been to

A．条件(1)充分，但条件(2)不充分．
B．条件(2)充分，但条件(1)不充分．
C．条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
D．条件(1)充分，条件(2)也充分．
E．条件(1)和(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．

直线x-y+k=0与圆y²=4x-x²没有交点．
(1) k＞1 (2) k＜-5