[請益] 句型問題
Among pure pharmaceuticals,the earliest to be isolated fromnatural sources
were the alkaloids.
從to be到sources那句感覺怪怪地
可以有人告訴我是怎樣的句型嗎
比如省略句或是....
多謝幫忙 另外這樣的句型適用時機如何
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