题目内容
—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 |
B
解析试题分析：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。
考点：考查固定短语
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