secretary / be / responsible / manager / serious mistakes.
A. The new secretary is responsible to the manager to the serious mistakes.
B. The new secretary is responsible for the manager to the serious mistakes.
C. The new secretary is responsible to the manager for the serious mistakes.
D. The new secretary is responsible for the manager for the serious mistakes.
Đáp án đúng là C. Cấu trúc: be responsible to someone for something: chịu trách nhiệm với ai về việc