【单选题】【消耗次数:1】
He studied hard in his youth, __________ contributed to his great success in later life.
that
it
what
which
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①  depends on
②  focuses on
③  concentrates on
④  dwells on
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①  is due to
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【单选题】 As a great innovator in American literature, Walt Whitman wrote his poetry in an unconventional style which is now called free verse, which is ______.
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