请帮我看一下这道六级听力题iftomandMarrydon'tc
if tom and Marry don'tcome to the party, I'll have 13. M: Let's inve two more just in case. Q: If everyone comes, how many will be at the party? (A) 13 (B) 17 (C) 30 (D) 15
17,不要想得太复杂