问题补充：
---- If you have any trouble, be sure to call me.
---- .
A. I am sorry to hear that
B. I will. Thank you very much
C. I have no trouble
D. I will think it over
答案：
A. I am sorry 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：句意：如果你有任何问题，请打电话给我。I am sorry to hear that听到那消息我感到很不安；. I will.Thank you very much 我会的，谢谢你。I have no trouble我没有麻烦。I will think it over我会仔细考虑它。故选B。
