问题
选择题
Although he has become wealthy, Mr. Wood remains ________ he used to be, modest and friendly.
A．when
B．where
C．how
D．what
答案
答案：D
D 考察名词性从句。_ he used to be 为表语从句，从句中缺少宾语，且表示内容，故使用what作为引导词。故D正确。
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