Question

5个英语选择题（有答案、求解析） 题目如下：

1. Once ______ that the boy is innocent, the teacher will let him go unpunished.A. convinced  B. convincing  C. to convince  D. be convinced 选A2.They should have informed you of the result of the competition by the time it was eventually given out,_____？A. haven't they B. didn't they C. shouldn't they D. hadn't they 选D
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Answer 1

1, Once （一旦），连词后面是一状语从句，主语同主句主语，the teacher ，省去了be动词，还原该状语从句，得：Once the teacher is convinced that the boy is innocent。be convinced that 相信⋯

追答

2, should have ＋过去分词。表示过去应该做而未做的事情。根据by the time 后用了过去式，可知should have informed 是表达过去完成。故用hadn’t they? 如果没有这个by the time... , 我们也可选B，didn’t they

3, 用it 指代上文中的主语从句（all the citizens enjoy free medical care ... ，其它三选项无此功能。

4, 这是个强调句型，被强调的是that引起的主语从句that its products are of high quality( 它的高质量的产品）第二个that无意义仅仅是构成强调句型的需要。附强调句型公式：It is ( was) ＋被强调部分＋that ＋句子剩余部分。

5, 和第4题一样，也是强调句型，不过是疑问句。被强调的是that引起的主语从句：that Stanley failed the driving test again。，again 后面的that是构成强调句型里的that。

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