Anne is said to _________ in Africa ,and she will come back

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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是动词不定式的完成形式作主补表示主语已经做了某事
选项D have been doing research是应该首先排除的选项因为不定式根本没有这种形式
注意不要把谓语形式与动词不定式的形式混为一谈
句子中根本没有过去完成进行时
这是并列的两个简单句第一个简单句是一般现在时的被动语态
句子意思是据说 Anne正在非洲做研究工作她将下个月回来
这里考查的是不定式的形式
根本与时态无关时态指的是谓语形式的时态

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