Jane had Aa great deal of trouble Bto concentrate on her study Cbecause of the noise in Dthe next room.

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问题 Jane had Aa great deal of trouble Bto concentrate on her study Cbecause of the noise in Dthe next room.

选项 A、 
B、 
C、 
D、 

答案B

解析 应改为concentrating on。
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