问题
选择题
I don't know _____. [ ]
A. how begin
B. what write
C. where to go
D. to choose which
答案
答案：C
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I don't know _____. [ ]
A. how begin
B. what write
C. where to go
D. to choose which
答案：C
由关系R通过运算得到关系S，则所使用的运算为