C.cause sb.to V
这种句子叫主动宾补结构,就是那个to V是补充说明宾语的,叫宾语补足语.类似的有：allow sb.to V; ask sb.to V; advice sb.to V; enable sb.to V; force sb.to V.
它们全是这种结构和用法.积累多了就明白了.不过,如果谓语动词是感官动词(see,hear,watch等)或使役动词,那个不定式是要省略to的.如：make/have/let/see/hear sb.V:let me see.He often makes me laugh.