问题

-So hardin the past few months that he has got an A in the Mid-term English Exam-I can see that only a few studentsfor it
A:has he worked; has the teacher praised
B:has he worked; the teacher has praised
C:he has worked; the teacher has praised
D:did he work; has the teacher praised
B:has he worked; the teacher has praised
C:he has worked; the teacher has praised
D:did he work; has the teacher praised
正确答案是: