【单选题】【消耗次数：1】
A well written composition _____ good choice of words and clear organization among other things.
①
calls for
②
calls on
③
calls up
④
calls off
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相关题目
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A well written composition ____ good choice of words and clear organization among other things.
①
calls for
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③
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④
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①
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①
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①
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②
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③
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⑤
特异性抑制依赖于DNA的RNA多聚酶活性