为什么用一般过去时而不用过去完成时

The 80000 objects collected by Sir Hans Sloane_______(form) the core collection of the British Museum opened in 1759.（2022新高考I）

官方答案是formed，这里为什么不能用had formed？

form在此为静态系词，表示一种状态的存在，而不是表示动作的发生。这个句子表示的是过去的状态，所以用一般过去时。以下为牛津词典对form这个语义的释义和例句：

have function/role

linking verb + noun： to be something; to have a particular function or pattern

The castle forms the focal point of the city.

The survey formed part of a larger programme of research.

These drawings will form the basis of the exhibition.

This family forms the core of the film.

The trees form a natural protection from the sun's rays.

曹荣禄 -

擅长：动词用法,句法问题 | 采纳率 82% | 回答于 2022-07-23 16:13

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