2. 外语
  3. Nancy had A(a great deal of) trouble B(to concentrate on) her work C(because of) the noise D(in) the next room.

Nancy had A(a great deal of) trouble B(to concentrate on) her work C(because of) the noise D(in) the next room.

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问题 Nancy had A(a great deal of) trouble B(to concentrate on) her work C(because of) the noise D(in) the next room.
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答案B
解析 应改为concentrating on。have trouble doing sth．做……很困难，固定用法。
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成人本科学位英语

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