When deeply lost in thought, _______ he often was, he would forget all about eating or sleeping.
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that
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where
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which
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推荐题目
—It’s good to see you again.—Yes. I keep all the letters __________ you wrote to me over the years.
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who
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After a pause for a drink, I took up my story just _______ I had left off.
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which
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We live in a society_____ there is a great deal of debate about competition.
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which
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We’d better hold more such activities, ______ students can combine study with fun.
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where
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that
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there
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which