展开全部 在but后何时要接带to的不定式，何时要接不带to的不定式有一条简单的规则。那就是前面动词是do（does/did/completed /executing/to perform）时，后接不带to的原形不定式；如前面用的是其他的动词，则后面的不定式要加上to。 Case study is almost nothing but an in depth research that is predicated on the scientific methodology. The primary aim of your case study essay assignment is to describe... https://cruzrkwhm.link4blogs.com/57864319/5-simple-statements-about-case-study-helper-explained