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【单选题】
设Visual FoxPro的有PROG1.prg、PROG2.prg、PROG3.prg三层程序依次嵌套，下面的叙述中，正确的是______。A.
在PROG1.prg中用! RUN PROG 2.prg语句可以调用PROG2.prg 子程序
B.
在四PROG2.prg中用RUN PROG3.prg语句可以调用PROG3.prg子程序
C.
在PROG3.prg中用RETURN 语句可以返回PROG1.prg主程序
D.
在PROG3.prg中用RETUN TO MASTER语句可返回PROG1.prg主程序
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A.
that
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D.
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A.
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B.
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