A set of keys __ (be)on the table怎么填?

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

A set of keys __ (be)on the table怎么填?
Is
我觉得是一套

are
keys 是复数

are

are,虽然前面有a,但是复数意义