According to Speaking skills， in making phone calls， when the hearer fails to catch something， he can say（）.

A.Could you put me through to the Accounting Department， please？

B.I'；m having trouble following you.Would you start again and speak a little more slowly？

C.Sorry， I didn'；t catch that， Did you say...？

D.Please wait while I check that for you.

正确答案：Sorry， I didn'；t catch that， Did you say...？