His friends go to Beidaihe by train _______vacation every year.
A.at
B.of
C.on
D.in
答案:C
go to sp on vacation 表示去某地度假的意思,故选答案为C
His friends go to Beidaihe by train _______vacation every year.
A.at
B.of
C.on
D.in
答案:C
go to sp on vacation 表示去某地度假的意思,故选答案为C