2道英语题,请详解,一定要详解,谢谢!
1.It is the teacher-and-students' interaction ( ) students should be the centre of the teaching ( ) makes classroom learning a more enjoyable process.
A where;that B.that;thatC.which;thatD.where;which
答案是A
2.Deep in the Atlantic Ocean,explorers have found ( ）may be the most valuable sunken treasure in history.
A.where B.which C.what D.that
答案是C
谢谢,急~
请详解