单项选择题
下列命令执行后的输出是()。
A、-b/k
B、-b/x
C、k*x+b
D、k*x=-b
下列命令执行后的输出是()。
A、-b/k
B、-b/x
C、k*x+b
D、k*x=-b
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单项选择题
When and why he came here ________ yet.
When and why he came here ________ yet.
A.is not known
B.are not known
C.has not known
D.have not known