题目内容

对于若干个联结词组成的非空集合S,若任意的命题公式都可由仅含S中的联结词等值地表示出来,则称S为____。

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设S是功能完备的联结词集,而S的任意非空真子集都不是功能完备的联结词集,则称S为____的功能完备的联结词集。

The family gathered together to __________ the holiday meals.

A. divide
B. share
C. receive
D. smell

Jenny __________ to pass her driving test at the fifth attempt.

A. managed
B. controlled
C. handled
D. regulated

I had to work hard to __________ the other students.

A. keep away from
B. keep up with
C. keep back
D. keep out