John's score on the test is the highest in the class; _______________.
A.he must have to study last night B.he must have studied last night C.he should have studied last night D.he should study last night正确答案B
John's score on the test is the highest in the class; _______________.
A.he must have to study last night B.he must have studied last night C.he should have studied last night D.he should study last night正确答案B
