Anne is said to _________ in Africa ,and she will come back next monthA do researchB be doing researchC have done researchD have been doing research我想问为什么不选D 过去完成进行时,就是相对过去的某个时刻来说已经对现在有直接影响并且还在进行的动作吗
问题描述：
Anne is said to _________ in Africa ,and she will come back next month
A do research
B be doing research
C have done research
D have been doing research
我想问为什么不选D
过去完成进行时,就是相对过去的某个时刻来说已经对现在有直接影响并且还在进行的动作吗
答
答案是 B be doing research这是动词不定式的进行形式 作主补 表示主语正在做某事 根据句子意思 应该选B选项 A do research是动词不定式的一般形式 作主补 表示主语将要做某事选项C have done research是动词不定式...