Mr. Hall understands that _______ math has always been easy for him, it is not easy for the students. 
#74580
A
unless
B
since
C
although
D
when
推荐题目
____________, I still couldn’t figure out what the headmaster said at the conference.
#68032
A
Though I didn’t listen attentively
B
Attentively as I listened
C
Attentively as did I listen
D
As long as I listened