They will get the preparation done early in May.
正确答案： D
本题解析：
首先需要注意 early in May 表示“五月初”的意思，选项 A “让别人准备完”这种表达是不准确的;此外 get the preparation done 表示的是“把准备工作做完” ，选项 B 的表达不是很准确。
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