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  3. Nancy had Aa great deal of trouble Bto concentrate on her work Cbecause of the noise Din the next room.

Nancy had Aa great deal of trouble Bto concentrate on her work Cbecause of the noise Din the next room.

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问题 Nancy had Aa great deal of trouble Bto concentrate on her work Cbecause of the noise Din the next room.
选项 A、 
B、 
C、 
D、 
答案B
解析 应改为concentrating on。 have trouble(in)doing sth．意为“做什么事情有麻烦”，为固定搭配。
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