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

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

出自：国家开放大学-人力资源管理-管理英语3

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