I invited my teachers my birthday party.A. to join in B. join in C. to join

问题补充：

I invited my teachers my birthday party.

A. to join in B. join in C. to join

答案：

解析：句意为：我邀请我的老师参加我的生日派对。invite sb to do sth：邀请某人做某事，join是及物动词，后可直接接宾语。故应选C。