(2013·哈尔滨四校高三统一检测)The old man often looked back on the past days ________ he worked hard to make a living.
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A
which
B
when
C
where
D
that
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That’s the new machine ________ parts are too small to be seen.（ ）
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Tom's first job was at a local restaurant in his early twenties，________he worked for seven years.
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Raising children is said to be a job _______ parents receive the least formal training.
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