the ability to speak, so he used sign language to municate with others.
A. As he lost
B. He lost
C. Having lost
D. His being lost
网友回答
A. As he lost
(答案→)B. He lost
C. Having lost
D. His being lost
解析：考查句子结构。因为第二句前面有连词so，说明前半部分是一个完整的句子。排除CD两项。A项中的as不能与so连用。排除A项。句意：他失去了讲话的能力，所以他用肢体语言与别人交流。故B正确。