they have no idea at all how busy we were
题目
they have no idea at all how busy we were
答案
绝对是一个正确的句子.他们（现在）一点也不知道我们（过去/当时）有多忙.they have no idea (= they don't know),at all (前面有no,加上这个 at all,意思等于 not at all) .how busy we were：我们过去/那时候/当时...
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