题目内容

_____are the birds doing? They are singing in a tree.

A. Who
B. What
C. How
D. Where

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Look,They are swimming in the river.I want_____you.

A. to go with
B. go with
C. helping
D. help

Is she____something?

A. eat
B. eating
C. eatting
D. eats

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如果一个演绎推理的形式正确，那么（）。

A. 其前提真时，结论一定真
B. 其前提真时，结论不一定真
C. 其前提假时，结论一定假
D. 其前提假时，结论一定真