32. The company ___ the management of its archives, but has been unable to do so. (A) is outsourcing (B) outsources (C) is outsourced (D) should outsource 正确答案是D,我对于答案是没有疑问。 但是我的疑问题目出的句型觉得很怪, 不是只有S+should/could/might+have p.p. 才能单句呈现吗? 其他的都要If S +...., S+.....的句型吗? 再请协助解惑,谢谢。