Review the item:
Bill went to the bank interview smelling of wet dog. He had __________ his one suit on the bed before going into the bathroom to shave. Dripping from the rain, Skipper, his Labrador retriever, decided the jacket made a perfect towel.

Bill put his one suit on the bed. Thus, you need a form of lay. Since the sentence has the auxiliary verb had, you need the past participle.

Consult the table below or review the rules.

Infinitive Definition Simple
Present
Simple
Past
Past
Participle
Present
Participle
to lay to put something down lay(s) laid laid laying
to lie to rest or recline lie(s) lay lain lying

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