Choose the correct conditional for an unreal past situation.
กIf we tested the backup, we would have discovered yesterday.
ขIf we had test the backup, we will discover the error.
คIf we would test the backup, we had discovered it.
งIf we had tested the backup, we would have discovered the error earlier.
เฉลยอธิบาย
third conditional ใช้ if + past perfect และ would have + past participle