they have no idea at all how busy we were

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they have no idea at all how busy we were

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 有多忙.

不太对,应该是:
they have no idea at how busy we were 他们根本无法想像我们有多么得忙……

不对,首先想表达“根本不……”的意思要用not at all, 并非no at all。

不对

句子语法都没问题!