When deeply lost in thought, _______ he often was, he would forget all about eating or sleeping. 
A．thatB．whereC．whichD．when
C

試題分析:考查定語從句。由結(jié)構(gòu)判斷此處是定語從句，從句缺少表語，用關(guān)系代詞，故排除B、D選項， 而that不引導(dǎo)非限制性定語從句，所以答案選C。句意：當(dāng)他陷入沉思中時，他總會忘記吃飯、睡覺，這種情況時常發(fā)生。
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