问题
选择题
—It's hot. Would you like some icecream?
—I'd like some, but I'm ________.
A．in a diet
B．on a diet
C．on diet
D．in diet
答案
答案：B
题目分析：句意：上文，真热啊。你想吃些冰激凌吗？下文，我想吃一些，但是我正在节食。Be on a diet是固定用法，意思是节食，选B。
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