ItA is requested Bthat every student Cwrites a paper Don sustainable development.

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问题 ItA is requested Bthat every student Cwrites a paper Don sustainable development.

选项 A、 
B、 
C、 
D、 

答案C

解析 句中谓语动词是request的被动语态式,因此其主语从句需用虚拟式动词(如果request用主动语态,则其宾语从句的谓语需用虚拟式动词),即:动词原形或者should+动词原形,故C应该改为write或should write.类似的动词还有:ask,move,suggest,require,order,propose,demand,command,desire,insist等,例如:He asked that he be given an opportunity to try.It was asked that they leve the following week.需要注意的是suggest如果不表“建议"而表“暗示”;insist不表“坚决要,坚决主张”,而表“坚决认为”时,其宾语从句的谓语动词则不需用虚拟式动词。例如:Are you suggesting that the air crash was not an accident?(宾语从句的谓语动词用的是一般过去时,而非虚拟式动词)He insisted that he had done right.(宾语从句的谓语动词用的是过去完成时,而非虚拟式动词)
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