Tom doesn't tell me when he           . I will call you as soon as he _____.[ ]

A. will come, comes    

B. will come, will come    

C. comes, will come

• A．条件(1)充分，但条件(2)不充分．
• B．条件(2)充分，但条件(1)不充分．
• C．条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
• D．条件(1)充分，条件(2)也充分．
• E．条件(1)和(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．

-3≤x≤3．
(1)|x-1|+|x+3|=4； (2)||x-1|-x|=1．