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their service, the workers of the hotel are active in learning English. [ ] A．Im

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their service, the workers of the hotel are active in learning English. [ ] A．Im

________ their service, the workers of the hotel are active in learning English.

[]

A．ImprovingB．To improve

C．Improve　D．Having improved

试题答案

答案：

解析：

不定式作目的状语。

标签：hotelofactiveareservice

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