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This book is cheap enough for him to buy it.为什么要去掉it

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This book is cheap enough for him to buy it.为什么要去掉it
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因为这里的it和前面的this book重复了.
sth is cheap enough for sb to buy.固定词组,对某人而言,某件东西足够便宜,他有能力去买(有买东西的钱)
后面不需要再加it了.