If you write 'had checked' on something versus just 'checked' on something...

[Ulan]

English Language Tests, Intermediate level

ESL/EFL Test #504 "English Slang Idioms (246)", question 1

"Our new product's success ......... on getting a patent for the electronics inside. We were unable to do so due to the fact that someone else already owns the rights to the electronic system. We are currently trying to contact the owner to see if he will sell his idea to us," Matt told management.

(a) linked
(b) hinged
(c) horned
(d) heckled

English Language Tests, Intermediate level

ESL/EFL Test #504 "English Slang Idioms (246)", answer 1

"Our new product's success hinged on getting a patent for the electronics inside. We were unable to do so due to the fact that someone else already owns the rights to the electronic system. We are currently trying to contact the owner to see if he will sell his idea to us," Matt told management.

Correct answer: (b) hinged
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If you write "had checked" on something versus just "checked" on something..is one incorrect and the other correct or are both accepted usage?

Ulan

[Mister Micawber]

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Either is possible. It depends on the rest of the sentence.
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Native English teacher at Mister Micawber's