I hardly had time to think these days, let alone relax.
为什么不能用letting alone作伴随状语?
这是习语,let为祈使语气。哟用于否定句之后,表示“更不用说...。” 遇到这种情况查词典。
《韦氏高阶》
let alone
— used to refer to something that is even less likely or possible than the thing previously mentioned
I can barely understand it, let alone explain it.
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