Verified Answer :

Dezbooboo123

Not long after we left I began to notice a knocking sound in my car \(Before\) there had only been the purr of the motor....... So the word you're missing is before which makes sense in the sentence... hope it helps :-)

ari1471

Not long after we left I began to notice a knocking sound in my car. Before, there had only been the purr of the motor.

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