The little boy stared at the strange man questioningly, not ________ whether to believe what he had said.

充值活动已开启，快来参与吧

当前位置：高中英语 / 词法 / 动词及动词短语辨析 / 动词的基本形式 / 动词现在分词

1. The little boy stared at the strange man questioningly, not ________ whether to believe what he had said.

A . to know B . knowing C . known D . having known