[单选题]

( 23 )已知有下面的过程( )

Private Sub proc1 ( a As Integer,b As String,Optional x As Boolean )

……

E.nd Sub

正确调用此过程的语句是

A. ) Call procl ( 5 )

B. ) Call proc1 5, ” abc ” ,False

C. ) proc1 ( 12, ” abc ” ,True )

D. ) proc1 5, “ abc ”

参考答案与解析:

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