—We're going for a picnic next Sunday, and I'd like you to join us.—____________！I have to see my grandmother. She has beenill for two weeks.A.What a pityB.Good luckC.That’s all rightD.Go ahead
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A解析考查交际用语，what a pity!真可惜，真遗憾 good luck 祝你好运 that's all right.没关系，不用谢 go ahead 好的，根据I have to see my grandmother. She has been ill for two weeks可知，他不能去，所以只能说真遗憾。