主语从句顾名思义(主句中的)主语是由一个句子充当。引导主语从句的连词有：who, whom, what, which, when, where, how, why, that , whether。 例如：1，Who will come doesn't matter.其中who will come 是主语从句。 2，What he said is funny.其中what he said是主语从句。 3，Which book was stolen is unknow now...
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