1- If only he ..........hard.
) "If only he _____ hard" is punctuated as a complete sentence, but it is not complete. For this reason, I would treat it as that typical incomplete sentence that people use in reacting to a failure. That means that the answer is c .
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(Your numbering system is erratic.)
"If only he _____ hard" is punctuated as a complete sentence, but it is not complete. For this reason, I would treat it as that typical incomplete sentence that people use in reacting to a failure.
That means that the answer is c. We always use the past perfect in that situation.
— Jerry failed his mathematics exam.