Either verb can be used. Were is more formal than was: If Harry was/were asked if he was home last night, he would say yes. If Harry had been asked if he was home last night, he would have said yes.
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Either verb can be used. Were is more formal than was:
If Harry was/were asked if he was home last night, he would say yes.
If Harry had been asked if he was home last night, he would have said yes.
CB