问题描述：
18英语选择具体为什么选择他,
you'd better take your umbrella with you _______it rains
A in case B as if C unless D in order that
英语选择具体为什么选择他,
you'd better take your umbrella with you _______it rains
A in case B as if C unless D in order that
英语选择具体为什么选择他,
问题解答：
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