题目

有如下VB程序段:m= Int(Rnd*3+1)*2For i=1 To 6-m For j=6 To i+ 1 Step-1 If a(j)<a(j- 1)Then t= a(j): a(j)= a(j- 1);a(j- 1)=t Next jNext i数组元素a(1)到a(6)的值依次为98,67,3, 81,38,21, 执行该程序段后,a(1)~a(6)各元素值不可能是( ) A . 3,98,67,21,81,38 B . 3,21,98,67,38,81 C . 3,21,38,67,98,81 D . 98,67,3,81,38,2116. —Who____ it be that is knocking at the door?   —It ____ be Father, but I’m not sure.  A.can; mustB.can; mayC.must; canD.may; must
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