Private managers are able to eke out better returns than would be possible if their assets were traded each day. 1. than 从句不缺 it ，什么成分都不缺。此句比较项 better 含在 returns（回报）中。在比较从句里面，如果被比较项修饰的returns 作主语，那么returns 必须省略，由 than 充当。 2. 是的，比较从句用了与现在或将来不符的虚拟语气。意指这仅是一种假设，未必能实现。 He never says more words than are necessary.
他从不多说多于必要的话。
He often eats more food than is good for his
health.
他吃的饭量往往多于对身体有益的量。 Children should not have more money than is
needed.
孩子们应该有的钱不应该超过所需要的。
More people hope to live in the countryside
than did before.
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