1.We are tired and nervous __the constant tension.

1.We are tired and nervous __the constant tension.
A:from B:for C:with D:off
常用的用法不是be tired(nervous) of doing sth?
2.What makes her so unhappy?
_____one if her favorite books.
A:Becaues she lost
B:Because of her losing
C:She lost
D:Her losing
3.History is a record of mankind,different historians,_____ interpret it differently.
A：therefore
B：contrary
C:however
D:consequently
4.When the student graducated from college,he got his ___
A:degree
B:certificate
C；license
D：bachelor
第2题的C为何不对?
第4题的B为何不对?获得文凭?certificate 有“证书,文凭”意思