题目内容

The question remains we should accept their invitation.

A. whether
B. that
C. if
D. why

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Free movie tickets will be sent tocome first.

A. whoever
B. whomever
C. whom
D. who

She is in doubtshe accepts your advice.

A. if
B. that
C. of which
D. whether

1、专门的关系运算包括___、、_和_____。

传统的集合运算都是从关系的“水平”方向即行的角度来进行的。

A. 对
B. 错