题目内容

下列命题公式中,哪些是合取范式?

A. P析取Q
B. P合取Q
C. P
D. (P析取Q)合取R

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If there is a lot of work _________.I’m happy to just keep on until it is finished.

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A. designed
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______ his love, Chris sent his mom a thank-you note on Mother’s Day.

A. Expressing
B. Expressed
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D. Having expressed

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A. left
B. to leave
C. leaving
D. having left

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