问题描述：
帮我看看这个英语题
I couldn't afford to rent a house like that,______ buy it.
A let alone B not to mention C to say nothing of D not to speak of
参考答案是A
可是BC都是更不用说的意思,为什么选A
I couldn't afford to rent a house like that,______ buy it.
A let alone B not to mention C to say nothing of D not to speak of
参考答案是A
可是BC都是更不用说的意思,为什么选A
问题解答：
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