I called you yesterday,but no one answered.( I called you because_英语解答

I called you yesterday,but no one answered.( I called you because I'll have a party
括号里填什么

人气：154 ℃　时间：2019-10-11 17:13:59

解答

what's the mattter?或者why did you call me 总之是问打电话的原因的.