2013年大学英语六遥作文遥句型2　　1 A number of factors are accountable for this situation A number of factors might contribute to the phenomenon.
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The answer to this problem involves many factors.
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The phenomenon mainly stems from the fact that.
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The factors that contribute to this situation include.
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The change in .
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largely results from the fact that.
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We may blame .
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,but the real causes are.
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Part of the explanations for it is that .
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　　One of the most common factors is that .
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　　Another contributing factor is .
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　　Perhaps the primary factor is that 　　But the fundamental cause is that .
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