题目内容

We can see a big tree in______ front of the classroom building.

A. its
B. a
C. the
D. /

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There is____ "s" in the word "us".

A. a
B. an
C. /
D. the

He likes playing football, but he doesn't like playing piano.

A. a, a
B. the, the
C. /, the
D. the, /

如线性规划的对偶问题无可行解，则原问题也一定无可行解。

A. 对
B. 错

互补松弛性只有在最优解时才成立。

A. 对
B. 错