I hope all the precautions against air pollution, _________

单选题 Unless ___________ by credit card, please pay in cash.

A．pay
B．is paid
C．paying
D．paid

单选题 __________, she will have my unswerving support.

A．Was she right or wrong
B．Whether right or wrong
C．Were she right or wrong
D．Be she right or wrong

单选题 He spoke in whispers __________ the servants should hear him.

A．so
B．so that
C．lest
D．in order that