若矩阵 ( 1 a −1 2, 1 −1 a 2 ,1 0 −1 2 ) 的秩为2,则 a的值为 。

A、<span lang="EN-US" style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-bidi-font-family: ">0</span>

B、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-bidi-font-family: "><span lang="EN-US">0</span>或<span lang="EN-US">-1</span></span>

C、<span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-bidi-font-family: "><span lang="EN-US">-1</span></span>

D、<span lang="EN-US" style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-bidi-font-family: ">-1</span><span style="FONT-FAMILY: 宋体; FONT-SIZE: 12pt; mso-bidi-font-family: ">或<span lang="EN-US">1</span></span>