题目内容：
一件工程，甲独做需要30天完成任务，乙独做需要20天完成任务。现在甲先做了若干天后，由乙接替，这样两人一共花了22天才完成任务。请问甲一共做了多少天？
参考答案：
答案解析：
单选题：一件工程，甲独做需要30天完成任务，乙独做需要20天完成任务。现在甲先做了若干天后，由乙接替，这样两人一共花了22天才完
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请在38处填写答案。（ ）
请在38处填写答案。（ ）
请在37处填写答案。（ ）
请在37处填写答案。（ ）