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【单选题】
下列程序段中,如果变量 a 中保存的字符是逗号“,”,则以下程序段执行后,变量 str 的值是A.
Unknown Character
B.
Punctuaton
C.
Upper Case
D.
Special Character
E.
不会
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A.
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B.
they threw him into the sea
C.
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A.
A motorist carelessly threw out a lighted cigarette.
B.
A man passed the forest and lit it on purpose.
C.
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D.
No one knew the cause.
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