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A
whether
B
unless
C
or else
D
in case
正确答案 :D
解析
【翻译】给我留个电话号码吧,以防我需要你的帮助。 [考点]词义辨析 【精析】D whether:是否;unless:除非,如果不;or else:否则;in case:以防,万一。根据题意可知,选D。
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