When deeply absorbed in work, ______ he often was, he would forget all about eating or sleeping.
A．thatB．whichC．whereD．when
B
考察定語(yǔ)從句（非限定性）。本題主句部分完整，且選項(xiàng)包含that, which因此在考查定語(yǔ)從句。應(yīng)先分析空格之后的句子成分，本題缺少was的表語(yǔ)，且空格前有逗號(hào)，應(yīng)選which。句意：當(dāng)他集中精力工作時(shí)，這種情況常有發(fā)生，他總是廢寢忘食。
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