第21题:[单选题]__________conscious of her moral obligations as a citizen. A.Marsha was and always will be B.Marsha has to be and always will be C.Marsha had been and will always be D.Marsha has been and will always be 参考答案:D 考查动词时态。四个选项中都有连词and连接两个时态,因此前后时态必须相互搭配,只有D项的前后两种时态搭配。连词前面用现在完成时态,后面用一般将来时态,表示从过去开始一直持续到现在并将延续到将来的一种状态。be conscious of意为“意识到”。句意为“Marsha一直记得而且也将永远记得她作为一名公民所应有的道德责任”。