作业帮it was a question of which one of them would reach himit 是形式主语吗,
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it was a question of which one of them would reach himit 是形式主语吗,
it was a question of which one of them would reach him
it 是形式主语吗,
it was a question of which one of them would reach himit 是形式主语吗,
是,实际主语是a question.
是 指代 a question