When deeply absorbed in work, __________ he often was, he would forget all about eating and sleeping.
A. which
B. who
C. that
D. whom
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I paid a visit to the company last month, __________ my brother are working.
A. which
B. who
C. where
D. that
I don’t like the people __________ smoke a lot.
A. whom
B. which
C. who
D. when
The question __________ I don’t understand is about grammar.
A. which
B. that
C. 不填
D. 以上全对
There is a beautiful little girl __________ name is Xiaowei.
A. who
B. whose
C. when
D. Which