Unit 4 Astronomy:the science of the stars
Period 1 Grammar points.
一.语法要点
主语从句:在复合句中作主句的主语的从句叫主语从句。引导主语从句的词有连词that, whether;连接代词who, what, which;连接副词when, where, how, why等。
Eg: Which team will win the match is still unknown.
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