____: remain in the same place or position 留在原处不动
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____: v. try to reach agreement by discussion 协商;谈判
____: be interested in 关心,感兴趣
____: vt. make oneself responsible for (sth.) 承担(某事物)
当Øp∨q 为假时,下列必假的公式是( )。
A. p∧Øq
B. Øp→q
C. q←p
D. p←Øq
E. Øq∧p