单项选择题

The Quality Control staff is responsible ______ the quality of the products that come out of the factory.

A．for
B．of
C．with
D．to
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(fortunate) ______,you have many articles online to help you in finding a job.
单项选择题
The new manager has greatly changed the company ______ he took over the position.
A．if
B．since
C．although
D．while
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