―Correct ____ is important.

―I agree. I don’t eat sweets now, for I’m on a _____.

A. diet; diet      B. food; food             C. diet; food             D. food; diet

 

D.

解析：diet和 food 均可作“食物”解。但前者是抽象名詞， 常作“飲食”而言， 或指為特殊的需要而規(guī)定的食物，可構(gòu)成詞組be on a diet， 意思為“節(jié)食”；food是一般用語，指具體的食物，凡是吃的，喝的都屬于food。它通常作不可數(shù)名詞，用單數(shù)，但在表示食物的種類時可用復(fù)數(shù)。

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