______ when to leave, I could only stay at home, _____ nothing.

A．Knowing not; done

B．Not knowing; doing

C．Having not known; done

D．Not having known; doing

在START研究中，有多少例男孩和多少例女孩参与？（）

A.1243例女孩和1695例男孩

B.1243例男孩和1695例女孩

C.1243例女孩和1243例男孩

D.1695例女孩和1695例男孩