单项选择题Theory is based on practice, ______ in turn serves practice.

A. that
B. what
C. who
D. which


延伸阅读

你可能感兴趣的试题

3.单项选择题This is the school ______ I studied for six years.

A. which
B. where
C. when
D. whom

4.单项选择题There are very few areas in the world ______ be grown successfully.

A. apricots
B. where apricots can
C. where can apricots
D. which can apricots

9.单项选择题He became a successful actor ______ his father never was.

A. who
B. whom
C. that
D. when

10.单项选择题There is no person ______ is always in the right.

A. who
B. whom
C. which
D. that