【題目】When deeply absorbed in work, ______ he often was, he would forget all about eating or sleeping.
A.that
B.which
C.where
D.when

【答案】B
【解析】句意：當他集中精力工作時，這種情況常有發(fā)生，他總是廢寢忘食。本題主句部分完整，且選項包含that, which因此在考查定語從句。應先分析空格之后的句子成分，本題缺少was的表語，且空格前有逗號，應選which。B為正確答案。

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