by the loss of such a valuable jewel,Rachel’s mother hires the famous detective Sergeant Cuff to investigate the theft.

1. A.
   Troubling
2. B.
   To trouble
3. C.
   To troubled
4. D.
   Troubled

　　　 by the loss of such a valuable jewel,Rachel’s mother hires the famous detective Sergeant Cuff to investigate the theft.

A.Troubling　　　　　　　　　　　B.To trouble

C.To troubled　　　　　　　　　　D.Troubled

_____ the loss of such a valuable jewel, Rachel's mother hires a famous detective _____ the thief.

1. A.
   Troubled by; investigating
2. B.
   To trouble; to investigate
3. C.
   Troubling; investigating
4. D.
   Troubled by; to investigate

_____ the loss of such a valuable jewel, Rachel's mother hires a famous detective _____ the thief.

[　　]

A．Troubled by; investigating

B．To trouble; to investigate

C．Troubling; investigating

D．Troubled by; to investigate