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【单选题】
一个有向图称为是强连通的，如果对于图中任意一对节点u和v，在一条从节点u到节点v的路径，也存在一条节点v到节点u的路径。下面的有向图不是强连通的（例如没有从节点4到节点14的有向路径），那么最少需要添加几条边就可使它成为强连通？【图片】A.
1
B.
2
C.
3
D.
4
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举一反三
【简答题】My eating________ (habit) are pretty good．
【单选题】—Has your father got up? —Sorry, I’m not sure. He __________ got up. Please go and see for yourself.
A.
must have
B.
can’t have
C.
would have
D.
might have
【单选题】_______very late last night, my brother got up late and went to school without breakfast this morning. [ ]
A.
Working
B.
Having worked
C.
Worked
D.
To work
【单选题】Why does your brother want a new job ________ he's already got a very good one?
A.
where
B.
when
C.
which
D.
that
【单选题】Mary got up early________ she could prepare breakfast for her brother.
A.
so that
B.
although
C.
as if
D.
even if
【单选题】We think _______ more vegetables _______ good for our health.
A.
eating, are
B.
eating, is
C.
eating, are
D.
eatting, is
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