单项选择题

The manager is well aware of a few other problems ______ he knows we have had with the customers in the past five years.

A. which
B. those
C. what
D. whichever
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单项选择题
The decision to allow casual dresses while working will give even flexibility on the part of employees.
A. great
B. greater
C. greatness
D. greatly
单项选择题
You should ask any questions regarding this matter of Dr. Raphael or one of ______ assistants.
A. he
B. him
C. his
D. himself
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