______ their service, the workers of the hotel are active in learning English.
A．ImprovingB．To improveC．ImproveD．Having improved
B

試題分析：考查不定式做目的狀語。不定式做目的狀語是考查的重點內(nèi)容。句意：為了提高他們的服務，賓館的員工們積極學習英語。A項可以作為伴隨狀語。故B正確。
點評：本題不難，句意理解是關鍵。動詞不定式的基本用法：動詞不定式能起名詞、形容詞和副詞的作用，可在句中作主語、表語、賓語補足語、定語和狀語用。同時還要注意動詞不定式的被動語態(tài)用法：如果動詞不定式的邏輯主語為這個不定式所表示的動作的承受者時，不定式一般就用被動語態(tài)形式，如：What is to be done next hasn’t been decided yet.
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