Question

为什么选D讲解一下谢谢

Answer 1

The man we followed suddenly stopped and looked as if ------whether  he  was  going  to  the  right direction.  A seeing  B    having seen    C   to  have see   D  to see

The man 【(whom) we followed定语】 suddenly stopped and looked (as if) (he wanted to see) whether he was going in the right direction.

动词不定式表目的 to see
这里没有必要用完成时 因为这里不是强调动作的先后

由于主句和as if 引导从句的主语都是 the man那个男人 ，所以he wanted 可以省略。 也就是答案d里头 原本为 he wanted to see. 省略后句子美观成熟。