有一读者问：有这样一道选择题：
It was so inconceivable that he would have stolen the money_________the suggestion was made that he might have been threatened.
A. which B. as to C. that
正确答案为C。这句话是什么意思？ that 起什么作用呢？
答案是正确的。让我们先分析一下这个句子，然后就知道这句话的意思和 that 所起的作用了。
首先要知道这句话的 it 是形式主语，其真实主语是 that he would have stolen the money （第一个 that 从句是名词性从句）。如不用形式主语，这句话就变作： That he would have stolen the money was so inconceivable that...可见全句用的是...so...that...句型，其基本结构是“主、系、表”。此一 that 从句（第二个 that 从句）的基本结构则是“主语 + 谓语”，that 是连词，the suggestion 是主语， was made （被动式）是谓语。 that he might have been threatened （第三个 that 从句）是一个由 that 引导的与 the suggestion 同位的同位语从句。（为了使从句结构取得平衡，同位语从句与其先行词被隔开了）
由此可见，这句话的意思是：说他会偷了钱是如此不可思议，以致于有人提出了他可能是受到了恫吓的看法。
