题目内容
A first aid kit is a box or bag of useful items and information that may be helpful______ an emergency.A. when B. unless
C. while D. in case of
答案:D
解析:
提示:
解析:
| “in
case of”意为“以防……”“万一……”,后可直接加名词,其他选项均不合句意。
|
提示:
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