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?
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?
John wasgiven the same suitcase his father and grandfather ____ (take) with them to school.这里是不是可以填 took / had taken / would take三种?如果用 had taken 的话,会不会被理解为“已经被带去学校,而没带回来”,类似于had gone to 用法?谢谢