问题

When deeply absorbed in work, ______ he often was, he would forget all about eating or sleeping.

A:that
B:which
C:where
D:when

正确答案是：

同类题型

inventions arewell received, but _____ function, they aren’t very successful

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So you didn’t say hello to her last night?—Well, I stopped and smiled when I saw her, but she __________ me and walked on.[ ]

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