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高中英语语法状语从句.you can borrow my car ______you promise not to dr

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高中英语语法状语从句.you can borrow my car ______you promise not to drive too fast
A unless B if C in case D as long as..答案是D虽然没错,但我选A有问题么?
高中英语语法状语从句.you can borrow my car ______you promise not to drive too fast
A unless B if C in case D as long as..
答案是D
选项A unless = if not .
把if ...not 带入句中就是:you can borrow my car【if】you promise【not】not to drive too fast.显然不对,你说是吗?