1、It is important that a college student____a foreign langua

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1、It is important that a college student____a foreign language.
A．will master B．master C．masters D．would master
2、It is strange that she____without saying a word.
A．should have gone out B．went
C．should go out D．goes out

一、“It is (was)+形容词（或过去分词）+that……”结构中的虚拟语气
在形如“It is (was)+形容词（或过去分词）+that……”结构中,使用某些表示愿望、建议、请求、命令、可能、适当、较好、迫切、紧近、重要等形容词后的主语从句的谓语也用虚拟语气.其表达形式为should ＋动词原形或省略should直接用动词原形（美国英语中省去should）
常用的形容词：* natural (自然的),appropriate (适当的),advisable (合适的),preferable (更可取的),better (更好的)* necessary (必须的),important (重要的),imperative (急需的),urgent (急迫的),essential (本质的),vital (必不可少的)* probable (很可能的),possible (可能的)* desirable (极好的)advisable（合理的）,compulsory（必须的）,crucial（紧急的）,desirable（理想的）,essential（必要的）,imperative（迫切的）,incredible（惊人的）,necessary（必要的）,possible（可能的）,strange（奇怪的）,urgent（紧迫的）.
常用的过去分词(Past Participle):* required (需要的),demanded (要求),requested (被请求的),desired (要求)* suggested (建议),recommended (推荐)* orderd (命令)
1选B省略了should
2,should have done表示应该做的事没做.这里显然是用虚拟语气表示推测他出去了,所以用一般陈述,选C

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