答案：D. that
解析：这是一个that引导的主语从句,that只是引导词,在从句中没有实际意义.因为这个从句太长了,作主语放在前面就会造成头重脚轻的现象,为了避免这种现象,用it作形式主语,把真正的主语从句放在后面.
翻译：她的儿子已经离家出走几个月了使这个母亲很担心.
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英语语法题it worried the mother a lot _____her son had been away
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