3道英语高考题求解1.When I talked with my grandma on the phone,she so

3道英语高考题求解
1.When I talked with my grandma on the phone,she sounded weak,but by the time we ___ up,her voice had been full of life.
A.were hanging B.had hung C.hung D.would hang
2.The biggest whale is ___ blue whale,which grows to be about 29 meters long—the height of ___ 9-story building.
A.the; the B.a; a C.a; the D.the; a
3.Being a parent is not always easy,and being the parent of a child with special needs often carries with ___ extra stress.
A.it B.them C.one D.him
第一题我的老师说by the time+从句=When从句,用一般过去式代替过去将来时,所以选C,但是为什么这句话要用“过去将来时”呢?还是有别的更好的解释方法?
第二题老师说因为是特指,所以用THE.但是要怎么判断“特指”还是“泛指”呢?
第三题完全听不懂老师讲什么.