How does the author view the hitherto high click-through rates?

ad.到目前为止,迄今 A: hitherto B: tire C: jog D: available

这个商标是依据迄今有效的(in force)法律注册的。(hitherto, in accordance with)

And indeed, what have I done ______, in the years behind me?  A: hitherto B: hijack C: hide D: anytime

Britain’s economy is largely based on its industry, ()a few hundred years ago it was an agrarian country. A: hitherto B: whereas C: whereby D: thereby

How does the author view the hitherto high click-through rates? A: They may be due to the novel way of advertising. B: They signify the popularity of interactive advertising. C: They point to the growing curiosity of TV viewers. D: They indicate the future direction of media reform.

What is the finding of the new study? A: Teenagers’ lifestyles have changed greatly in recent years. B: Many teenagers resort to drugs or alcohol for mental relief. C: Teenagers experiencing psychological problems tend to use a lot of media. D: Many hitherto unobserved youngsters may have psychological problems.

He freed music from [color=#ff3853]hitherto[/color] prevailing conventions of harmony and structure. A: adv. 尽管如此；然而；但是 B: adv. 迄今；至今；到目前为止 C: adv. 远；很大程度上；久远 未知类型：{'label': 'source', 'content': '2014年英语一翻译', 'isMemberControl': 0, 'type': 181}

He freed music from hitherto prevailing conventions of [color=#ff3853]harmony[/color] and structure. A: n. 和谐；协调；融洽；和声 B: n. 电影；薄层；电影业 C: n. 暴风雨；狂风；猛攻 未知类型：{'label': 'source', 'content': '2014年英语一翻译', 'isMemberControl': 0, 'type': 181}

What is the finding of the new study? 未知类型：{'label': 'questionDesc', 'content': '请根据材料选择正确答案。', 'isMemberControl': 0, 'type': 181} 未知类型：{'label': 'source', 'content': '2016年12月 六级 卷一 仔细阅读2', 'isMemberControl': 0, 'type': 181} A: Teenagers’ lifestyles have changed greatly in recent years. B: Many teenagers resort to drugs or alcohol for mental relief. C: Teenagers experiencing psychological problems tend to use a lot of media. D: Many hitherto unobserved youngsters may have psychological problems.