Not until you talked with him ______ that he had made a serious mistake.
A.that he realized
B.when he realized
C.he realized
D.did he realize
第4题
计算机的内存中有一项占据4个字节的数据,内容依次为61H,41H,31H,51H,这项数据可能是()。
A.汉字,西文混合字符串
B.汉字字符串
C.西文字符串
D.控制字符串
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