Question

If you (read),you could have passed.

Answer 1

Uf you have read ( third form of read), you could have passed.
Hope it helps...
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Answer 2

Answer :

This question is based on tenses.

The correct sentence is :

If you had read, you could have passed.

Tenses are defined as the verb forms that specify the point of time during which the stated action happened.

In the given sentence, the past perfect tense will be used. It is used for actions that happened at some time in the past before some other action happened.