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【单选题】
数字证书的分类不包括（）。A.
个人数字证书
B.
软件著作权证书
C.
软件数字证书
D.
企业数字证书
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反馈参考答案：
举一反三
【简答题】已经定义a=3,执行语句a+=a-=a*=a+2后,a的值是( )。
【单选题】Many a player who had been highly thought of has ________ from the tennis scene.
A.
disposed
B.
disappeared
C.
discouraged
D.
discarded
【单选题】Many a player who had been highly thought of has ________ from the tennis scene.A．disposedB．disapp
A.
3. Many a player who had been highly thought of has ________ from the tennis scene. A．disposed
B.
disappeared
C.
discouraged
D.
discarded
【单选题】— _____ are these clothes? —They are those _____ . [ ]
A.
Whose; player's
B.
Who's; player's
C.
Whose; players'
D.
Who's; players'
【简答题】Many a player who had been highly thought of ______ from the tennis scene．许多得到高度评价的运动员都已经从网球赛场上消失了。
【单选题】Many a player who had been highly thought of ______ from the tennis scene.
A.
have disappeared
B.
has disappeared
C.
disappear
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