問題詳情：
________he referred to in his article was often discussed by many people in the past.
A．That B．What
C．Whether D．Where
【回答】
B解析： 考查名詞*從句。此句中referred to後缺少賓語，因此應用what引導該主語從句。
知識點：連詞
題型：選擇題
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