问题描述：
英语第29题
How long have you been writing this paper?I hope you are ____ your subject.
A.holding up
B.looking over
C.resulting in
D.sticking to
How long have you been writing this paper?I hope you are ____ your subject.
A.holding up
B.looking over
C.resulting in
D.sticking to
问题解答：
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