HE IS VERY WORRIED ABOUT HIS NEW JOB _______ HE IS NOT QUITE PREPA...

16. - 25 DE THI HOC KI 1 MON TIENG ANH LOP 12 CO DAP AN 16. - 25 DE THI HOC KI 1 MON TIENG ANH LOP 12 CO DAP AN
25 DE THI HOC KI 1 MON TIENG ANH LOP 12 CO DAP AN

16.

He is very worried about his new job _______ he is not quite prepared for working.

A. although

B. but

C. because

D. so