When ____your last trip?On Sept.2nd.A isb werec.was急.下午要

问题描述:

When ____your last trip?On Sept.2nd.
A is
b were
c.was
急.下午要

C
根据语境:你的上一个旅程是在何时?
显然是对过去情形的提问和回答.last trip为单数.