问题补充：
His friends go to Beidaihe by train vacation every year.
A. at
B. of
C. on
D. in
答案：
A. at
B. of
(答案→)C. on
D. in
解析：go to sp on vacation 表示去某地度假的意思，故选答案为C
500字范文，内容丰富有趣，生活中的好帮手！
时间：2023-10-27 07:50:58
His friends go to Beidaihe by train vacation every year.
A. at
B. of
C. on
D. in
A. at
B. of
(答案→)C. on
D. in
解析：go to sp on vacation 表示去某地度假的意思，故选答案为C
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