When deeply absorbed in work, ______ he often was, he would forget all about eating or sleeping.
A. that
B. which
C. where
D. when
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We live in an age _____ more information is available with great ease than ever before.
A. why
B. when
C. to whom
D. on which
Ellen was a painter of birds and nature, ______, for some reason, had withdrawn from all human society.
A. which
B. who
C. where
D. whom
The air quality in the city, ______ is shown in the report, has improved over the past two months.
A. that
B. it
C. as
D. what
It is the third time that she has won the race, _______ has surprised us all.
A. that
B. where
C. which
D. what