He lost his money.His money was _____.(a)losing (b)missing (

.
Lost the money meaning it happened in the past,so it is not losing.He did not continuously lost the money.
However,since the money is gone,that's why it is missing.
The following sentence can use losing -
He has LOST a lot of money in the casino and he is still losing heavily.
It means he is still gambling and still losing his money in the games.
So,don't gamble :-)
Good luck

B... 钱不见了。。。。用missing...
用lose...要用 lost...因为钱被（人）丢了。。

He lost his money.His money was _____.(a)losing (b)missing (c)going away (d)disappearing
【答案】B
【分析】这里需要一个形容词，指钱丢了，missing做形容词来讲的时候，理解为“失掉的，失踪的找不到的”。

lose : 丢失; sb lose sth 人丢失东西
miss : 怀念, 错过, 丢失(missing adj.) My keys are lost/missing.
I lose my book/My book was lost/is missing./be missed.
人丢了只能用missing : My child is missing.
missi...

答案是lost和missing,表示“丢了，不见了”