问题

Mr. Hall understands that _______ math has always been easy for him, it is not easy for the students.
A:unless
B:since
C:although
D:when
B:since
C:although
D:when
正确答案是:
同类题型
Believe it or not! If you travel by jet plane, Tokyo and Shanghai are ________ neighbors
You ___________ finish the report today. Any timebefore this weekend is OK.
I feel that one of main duties a teacher is to help the students to become better learners[ ]