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问题: One way of gradually getting learners to understand most of a text the first timee__they heat it,is

to use parallel texts.
the right answer is:/
i choose:when
why

解答:

我觉得这是一个平行结构,is they heat it,和is to use parallel texts平行。
第一个is前面的One way of gradually getting learners to understand most of a text the first timee整个是主语,然后they heat it是一个表语从句。
the first time已经是时间了,如果在用when引导从句,一个句子中就有了两个时间
这个句子的主要结构是:one way is.....,is......