B．are
C．is not
D．are not
（ ）42．It is foolish _________ such a mistake．
A．for me to make
B．for me making
C．of me to make
D．of me making
（ ）43．It is chairman of the department _________ the teaching staff elected him．
A．what
B．whom
C．which
D．that
（ ）44．I prefer _________ there doing nothing．
A．working than sitting
B．to work than to sit
C．working to sit
D．to work rather than sit
（ ）45．All _________ has already been done．
A．can be done
B．should be done
C．that can be done
D．what should be done
