听力原文:W: If Tom and Mary don't come to the party, I'll have 13.M: Let's invite two more
听力原文:W: If Tom and Mary don't come to the party, I'll have 13.
M: Let's invite two more just in case.
Q: If everyone comas, how many will be at the party?
(19)
A.13
B.17
C.30
D.15