_ LI Lei _ to go swimming in the river A.Used;to B.Did use C.Did :used D.Use :did
问题描述：
_ LI Lei _ to go swimming in the river A.Used;to B.Did use C.Did :used D.Use :did
答
B sb used to do sth 某人过去常常做某事 前面用过去时后面就原形