90. Once lost, _____.　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　

A. it is said to get such a chance again. 　　　　　　 B. One can never get such a chance again.

　 C. such a chance will never come again　　 　　 D. to get such a chance will be difficult.