请说明理由.

题目

请说明理由.
1、More than one studend______ever been to Beijing before.
A.has B.have C.had D.having
2、Ten minus six ______ four.
A.are B.be C.is D.am
3、Tom as well as her sisters ______ Chinese in Peking University.
A.are studying B.have studied C.studies D.study
4、My family ______ going on a trip to Shanghai this summer holiday.
A.is B.are C.have D.has
5、Doing exercises and walking ______ good for our bodies.
A.are B.is C.have D.has
6、A student or two ______ the exam.
A.has failed B.have failed C.had failed D.fail

答案

a
c
c
b
a
a