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外语
I’ m sure the letter won’ t arrive in time ______ it is sent by air.
I’ m sure the letter won’ t arrive in time ______ it is sent by air.
admin
2009-05-28
68
问题
I’ m sure the letter won’ t arrive in time ______ it is sent by air.
选项
A、if
B、until
C、because
D、unless
答案
D
解析
本题考查条件状语从句。此句意为:我敢肯定这封信不能及时到达,除非用航空邮件。此处需要一个连词,从句意上看,只有unless符合题意,表示“除非…否则”,相当于“if..not”。注意:别因为有won’t而错选了until,until后应该接时间状语从句,如:I won’t stop shouting until you let me go.
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本试题收录于:
大学英语三级B级题库大学英语三级分类
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大学英语三级B级
大学英语三级
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