请问老师：Recent research undertaken by the Department of Mysteries reveals that magic can only be passed from person to person when Wizards reproduce. Where no proven Wizarding ancestry exists, therefore, the so-called Muggle-born is likely to have obtained magical power by theft or force.加...
...involved memory: training a person to hear and then repeat a random series of numbers.【参考译文：差不多30年前，他的第一个实验与记忆力直接相关，即训练一个人听一系列随机的数字，然后再重复这一系列随机的数字。】我的问题是：(1) 这个句...
...e choose this hotel because the price for a night here is down to $20,half of_________it used to charge.A.that B.which C.what D.how老师，这题选C，为什么不是定语从句...
The outcome of the review is likely to be just a tweak to its target or communications policy and a decision not to change to its tools.请问老师change to its tools的to是否多余？
...n were guilty. 当时普遍认为这两名男子都有罪。The scale of the problem is now universally recognised. 现在全世界的人都已认识到了这个问题的严重性。请教专家：像这类句子中的 generally,universally 是程度副词吗?
... circumstances ( ) the average size of a tribe was only a few hundred people.个人认为，该空应该填that，是一个同位语从句，circumstance意为情形、情况，可答案给的是where。请教一下各位老师，这题为啥that是错的。
Gone from him, too, seemed to be any memory of how our marriage had begun to disintegrate well before our arguments over his leaving for Area X. 请问 Gone from him, too, seemed to be any memory 是倒装用法么？
Workers at a handful of firms, including Amazon and Walmart, have made superhuman efforts to fulfil online orders, and their investors have made supernormal profits as Wall Street has bid up their shares on euphoria that Western retailing is at the cutting edge.定语从句，状语从句还是同...