单选题 Mr Smith wondered______his daughter had ever been fond of music.
  • [A] who
  • [B] if
  • [C] what
  • [D] that


【正确答案】 B
【答案解析】后面从句已经不缺句子成分了，所以排除A、C。选项D不符合句子中wonder(疑惑)的意思。