In the past year, however, software companies have developed tools that allow companies to “push” information directly out to consumers, transmitting marketing messages directly to targeted customers.请问:transmitting的逻辑主语是?
None of them easy fixtures, admittedly, but still the kind of matches in which a star player such as Tevez is expected to deliver.这个句子好像没有主语和谓语,它是句子吗?谢谢老师。
The problem is that catalysts and membranes have been expensive until recently.请问这里catalysts and membranes是最近才开始变贵,还是从以前到最近一直都是这么贵,还是说以前一直贵,但最近不贵了?还请教 until recently 是否有多种不同的用法?