my friand got many gifts———his thirteenth birthday.A.in B.on C.at D.for 为啥?

问题描述:

my friand got many gifts———his thirteenth birthday.A.in B.on C.at D.for 为啥?

B 特指在他十三岁生日那天那啥,答案是D……答案错了?我还是坚持B