我觉得不是lask 而是TASK 任务的意思.
选B.All of这里表示一个整体所以用第三人称单数.
从后面的we're ready to start可以发现,这个题目的时态是一般现在时.
不存在过去,所以也排除了 C,过去完成时.
因此选B.
All of the preparation for the lask ------been completed and
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