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问题 选择题
The girl succeeded in _____ a job yesterday.
A. find
B. find out
C. finding
D. finding out
答案

答案：C

选择题

Though       to a higher position, she still didn’t content herself. [ ]

A.promoting

B.being promoted

C.having promoted

D.promoted

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单项选择题

如下图所示，两个关系R1和R2，它们经过哪种运算后得到R3

A．R∪S

B．R-S

C．R×S

D．R

S
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