Nancy had (a great deal) of trouble (to concentrate on) her work (because of) th

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

选项 A、a great deal of
B、to concentrate on
C、because of
D、in

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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