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2011年12月四六级考试免费测试平台-为学员提供全真考场模拟演练机会! 七、An advantage of ~~~ is that + 句子 例句：An advantage of using the solar energy is that it wont create any pollution. 用太阳能的优点是它不会制造任何污染。 八、The reason why + 句子 ~~~ is that + 句子 例句：The reason why we have to grow trees is that they can provide us with fresh air./ The reason why we have to grow trees is that they can supply fresh air for us. 我们必须种树的原因是它们能供应我们新鲜的空气。 九、So + 形容词 + be + 主词 + that + 句子 例句：So precious is time that we cant afford to waste it. 时间是如此珍贵，我们经不起浪费它。 | 
