对于字符串“software”,其长度为2的子串共有( )个。A.4 B.7

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问题 对于字符串“software”,其长度为2的子串共有(  )个。A.4B.7C.28D.56

选项 A.4
B.7
C.28
D.56

答案 B

解析 对于字符串“software”,其长度为2的子串有:"so","of","ft","tw","wa","ar","re",共7个。
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