There is no doubt that all this puts a large on a teacher with a large number of classes.
A. tax
B. catastrophe
C. sense
D. burden
网友回答
A. tax
B. catastrophe
C. sense
(答案→)D. burden
解析：tax 税,税款,税金; catastrophe大灾难,大祸; sense感觉,意义,理性;burden担子,负担。a large burden 一个很大的负担。