单项选择题

Henry can't attend the party () at Tom's house at present because he is preparing the speech at the party () at Marie's house tomorrow.
A.held; being held
B.to be held; to be held
C.to be held; held
D.being held; to be held

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TCP/IP是参照ISO/OSI制定的协议标准。（）

答案：错误

单项选择题

设I是如下一个解释：D＝{a,b}, 则在解释I下取真值为1的公式是( ). A. xyP(x,y) B. xyP(x,y) C. xP(x,x) D. xyP(x,y).