问题补充：
---If you have any trouble, be sure to call me. ---______. A.I am glad to hear thatB.I will. Thank you very muchC.I have no troubleD.I will think it over
网友答案：
热心网友 1楼
B解析根据本句If you have any trouble, be sure to call me.可知if 引导的条件状语从句，在if 引导的时间状语从句，主句为祈使句，而从句用一般现在时，代替一般将来时，故选
