A set of keys __ (be) on the floor.怎么填?

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A set of keys __ (be) on the floor.怎么填?
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A set of keys __ (be) on the floor.怎么填?
A set of keys __ (be) on the floor.怎么填?

A set of keys __ (be) on the floor.怎么填?
应该填 is
a set of 的意思是"一套,一组"
所以后面接的名词一定是复数
而对于它的谓语,因为是 a set 一套,所以用单数is
如果是two sets of ,那么谓语就应该用are

is
set 是一套的意思
就像a pair of shoes

A set of keys is on the floor
a set of keys"指一套钥匙,表单数概念,所以后边的动词用单数.

is 因为A set of keys指一串钥匙 用单数

is.一串是单数