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一道英语选择题,连词63.It is only _____people know the importance of s

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一道英语选择题,连词
63.It is only _____people know the importance of science ______science can really serve the
people.A.that,when B.when,that C.then,that D.that,then
一道英语选择题,连词63.It is only _____people know the importance of s
B. when, that
强调句it is ... that
Only when people know the importance of science, science can really serve the people.
本身就是一个完整的句子.
再问: 但是答案是C啊?是答案错了吗?
再答: 答案错了.怎么会选C...