had he worked harder he ——the final examination A must have

had he worked harder he ——the final examination A must have Had he worked harder,he（ ）the exams.A.must have got through He didn’t pass the final examination.He ______ it.选项:a、must —— the exam,he worked harder.A Passing B To passing C Pass D if he had worked harder,he would have succeeded,这里为什么要用would He didn’t pass the final examination.He ______ it. He didn't pass the final examination.He _______ it. what he wore,he must have had a long journey during the davs ( ),he worked harder than ever.A following B ____he worked harder than before,he didn't pass the exam.A.u He had a good____of the examination result when he saw his d He studied very hard ,but he failed in the final examination