The professor gave orders that the experiment---- before 5:3

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/17 01:47:43

The professor gave orders that the experiment---- before 5:30p.m.
A. be finished B. will finish
C. must be finished D. would be finished
选什么,为啥呀,thanks a lot~~

选C
【句意】教授下命令说实验必须在5:30前完成
【解析】情态动词must在这里表示说话人的语气,与前面的order 正好可以呼应
再问：答案是A怎么理解呢
再答：噢噢噢噢噢噢！嘛呀！！！！疏忽了，不小心误人子弟了，实在不好意思！先道歉前面有个order 句子用虚拟语气，从句中应该用 should + 动词原形，should可以省略原本应该是should be finished 省略后就成了 be finished 【详解】虚拟语气的用法类似的词可总结为：一“坚持”（insist）、二“命令”（order,command）、三“建议”（propose,suggest,advise）、四“要求”（ask,demand,request,require）。动词（包括与这些动词相关的形式〔如suggestion等〕）后面的【宾语从句】，无论过去、现在、将来，谓语动词的形式都只能为“should+动词原形”（should可以省略）。
再问：虚拟语气也可以用would 吧？？？有order就可以不考虑语气了吗
再答：我后面有补充了一下，你再看一下倒数的两行

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