Charles Smith, ______ was my former teacher, retired last year.
A. which
B. who
C. that
D. as
that不能引导非限制性定语从句, 可以用which和who引导, 其中, who代替的先行词是人。句意为:查理?史密斯去年退休了, 他曾经是我的老师。
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