We feel ________ our duty to make our country a better place.
A.it
B.this
C.that
D.one
答案:A
There ____ a talk show on CCTV-4 at eight this evening .
A.is going to be
B.will have
C.is going to have
D.is having
双代号网络图中,在节点之间可以出现带双箭头或无箭头的连接。( )