题目6A. TEST n1 CASE 1,2:routine1; CASE 3:routine2; DEFAULT: routine3; ENDTESTB. TEST n1: CASE 1 routine1; CASE 2 routine2; CASE 3 routine3; DEFAULT routine4; ENDTESTC. TEST n1 CASE 1:routine1; CASE 3:routine2; DEFAULT: routine3; ENDTESTD. TEST n1 CASE 1:routine1; CASE 2:routine2; CASE 3:routine3; ENDTEST