单项选择题
[听力原文] W: Why did Jack fail in the exam M: If he had studied hard, he would have passed the exam.
A.Jack didn’t study hard. B.Jack studied very hard. C.Jack passed the exam. D.Jack failed in the exam.
A.Have a rest. B.Take a walk. C.Give more information. D.Wake him up.
A.4. B.8. C.12. D.15.