—If you have any trouble, be sure to call me. — _.
A. I am glad to hear that
B. I will. Thank you very much
C. I have no trouble
D. I will think it over
网友回答
A. I am glad to hear that
(答案→)B. I will. Thank you very much
C. I have no trouble
D. I will think it over
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,故选答案为B