If you have__when we__,please call me up.

问题描述:

If you have__when we__,please call me up.
A.any idea;will start
B.any idea;start
C.no idea;will start
D.no idea;start
精通英语者请给个答案,
(请不要乱给答案,导致误人子弟)
补充:前面那句是什么从句?

A
如果你想好了我们什么时候开始,再叫我