有没有变化格式要求?否则有很多种变化形式,如：
= They think (that) it is necessary to practice speaking English in class.
= They think practicing speaking English necessary in class.
= They think (that) to practice speaking English is necessary in class.
= They think (that) practicing speaking English is necessary in class.
注：( ) 表示其内部分可以省略不写.
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