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A
as
B
while
C
unless
D
if
正确答案 :C
解析
本题考查句法——状语从句。
句意:____你答应照看好我的电脑,否则我不会借给你。
C项:unless 除非,可引导条件状语从句。符合题意,故选C。
A项:as 因为;虽然;作为;随着。可引导原因、方式、时间和让步状语从句。不符合题意,故排除。
B项:while 当……的时候;虽然;然而。可引导让步和时间状语从句。不符合题意,故排除。
D项:if 如果;是否。可引导条件状语从句。不符合题意,故排除。
故本题答案为C。
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