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【单选题】
在MySQL中进行授权操作时,可根据需要指定的选项有( )。 1 被授权用户的用户名 2 被授权用户的登录地点(IP) 3 可操作的数据库对象 4 欲授权的权限种类A.
① 、 ③
B.
① 、 ③ 、 ④
C.
① 、 ② 、 ③
D.
① 、 ② 、 ③ 、 ④
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举一反三
【单选题】_______ after a long walk,Henry called and said he couldn't come to the meeting. [ ]
A.
Having worn out
B.
Being worn out
C.
To wear out
D.
Worn out
【单选题】The author says Johnson found it very difficult to walk because ______.
A.
he couldn't control his legs
B.
he generally wore irons round his legs
C.
people always stared at him
D.
it hurt his friends to watch him
【单选题】________ out after a long walk,Mike called and said he couldn’t come to the party.
A.
Having worn
B.
Being worn
C.
To wear
D.
Worn
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