______ 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(diǎn)內(nèi)容。句意：為了提高他們的服務(wù)，賓館的員工們積極學(xué)習(xí)英語。A項(xiàng)可以作為伴隨狀語。故B正確。
點(diǎn)評：本題不難，句意理解是關(guān)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(bǔ)足語、定語和狀語用。同時(shí)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(gè)不定式所表示的動作的承受者時(shí)，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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