问题描述：
he can't see the blackboard clearly,because he sits()the classroom.A.in front of B.at the back of
C.in the front of D.behind
we go to()school on weekdays,and sometimes go to()cinema at weekends.
A./;the B.the;the C.the;/ D./;/
C.in the front of D.behind
we go to()school on weekdays,and sometimes go to()cinema at weekends.
A./;the B.the;the C.the;/ D./;/
问题解答：
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