—Correct ____ is important. —I agree. I...

—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。但前者是抽象名词，常作“饮食”而言，或指为特殊的需要而规定的食物，可构成词组be on a diet，意思为“节食”；food是一般用语，指具体的食物，凡是吃的，喝的都属于food。它通常作不可数名词，用单数，但在表示食物的种类时可用复数。

考点分析：

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