题目内容：
Many disasters allow no time for people to gather even the most basic necessities, which is__________ planning ahead is essential.选择一项：
A. why
B. because
C. since
参考答案：
选择题：Many disasters allow no time for people to gather
- 题目分类：国家开放大学-人力资源管理-管理英语3
- 题目类型：选择题
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选择一项：
A. why
B. because
C. since