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仅仅二道语法题和一道词汇题,语法老师进哦.

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仅仅二道语法题和一道词汇题,语法老师进哦.
1.and told them that ______ order them to go away they were not to take them seriously.
A.should the police B.if the police did
2.were grateful to the student for _____ in advance.
A.having informed them this B.informing them of this
3.a student had dressed up as a policeman and was amusing himself himself______
A.by making fun of people.B.at other people's expense
请问老师们为什么要选择那个答案,以及另一个答案为什么不正确呢?.
仅仅二道语法题和一道词汇题,语法老师进哦.
1.这是一个使用should表达的虚拟语气,即if the police should order them.should在这里表示万一的意思.高二一篇课文中有一句:Should you have energy left ,you can work out in the gyms.万一人你还有力气的话,你可以去健身房锻炼一下.
2.这里只是表示一件事,因...而感激,不必要表示两个动作之间的先后关系,如果用A,那就表示动作之前的先后关系,这里显然不是这样.
3.at one’s expense是习语,意为“嘲弄某人”,“使某人受精神损失”. 当然,这个短语还可以指"由.付费"