可随父母呼出气使婴儿接触的毒物是（）

A．铅、汞、苯

B．石棉

C．二氧化硅

D．有机溶剂

E．煤尘

_______ which way to take, the little boy behaved like a real gentleman who comforted his sister from time to time.

A．Leaving to wonder

B．Having left to wonder

C．Left wondering

D．Left to wonder