填空题____
填空题
____
参考解析
解析：
空格前的“it”与“a major factor”中的“a”相互对应，动词“become”后跟名词、名词短语或形容词，所以只有“a major factor”符合题意。
空格前的“it”与“a major factor”中的“a”相互对应，动词“become”后跟名词、名词短语或形容词，所以只有“a major factor”符合题意。
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