一道英语选择The singer and dancer _______our evening partyA.is to attend B.were to attend C.was attended D.are attend怎么选为什么

答案应选A,全句句意为：那位歌唱家和舞蹈家要来参加我们的晚会.
这个题目考查了两个点,1.动词的时态；2,主谓一致.
1.从句意来看,这是个表将来的动作,所以应用一般将来时的表达法之一,即：be to do sth;
2.两个名词前只用了一个冠词the,即,The singer and dancer说明主语是一个人,即那是个"歌唱家和舞蹈家"；如果两个名词前都有冠词the,如the singer and the
dancer,那就是两个人,即“那个歌唱家和那个舞蹈家”,因此,谓语动词应用单数.
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