5．I'd appreciate _______if you could come and help me once more and I always appreciate _______me with my English in the past．（　　）
A．this； you to helpB．that； your helping
C．it； you to helpD．it； your helping

分析 假如你能來再幫我一次我將不勝感激，而且我總是感激你在過去幫助我的英語．

解答 答案是D．考查it的用法．I'd appreciate it if…是固定搭配，表示"如果…我將不勝感激"．所以空格一用it作形式賓語，真正的賓語是后面的if從句．同時appreciate后面可以接動名詞作賓語，空格二用your helping．故答案是D．

點評 解答此類題目，首先需要明確句意，然后根據(jù)相關語法及固定搭配選擇正確的答案．

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