Heworkedhardandachievedwhathes-优题课

He worked hard and achieved what he set out to do, but ________ what he had owned, including his health and his marriage.

A．at the mercy of	B．at the risk of
C．at the cost of	D．at the service of

科目英语题型单选题难度较易

知识点：介词

Sarah hopes to become a friend of ______shares her interests.

______leaves the room last ought to turn off the lights.

. It is generally considered unwise to give a child _____he or she wants.

_____ the 2000 Olympic Games will be held in Beijing is not known yet.

What the doctors really doubt is _____my mother will recover from the serious disease soon.