Since he has had a reputation for being a careful driver,his accident came as quite a surprise语法

Since he has had a reputation for being a careful driver,his accident came as quite a surprise语法

题目
Since he has had a reputation for being a careful driver,his accident came as quite a surprise语法
为什么用since 不用for
答案
for引导从句表原因时不能放在句首.而且后面已经有个for了,英语是比较忌讳重复的.
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