I ___ out when the phone ranghappenhappenedhappened tohappened to he
问题描述:
I ___ out when the phone rang
happen
happened
happened to
happened to he
答
happened to be
答
happened
记住when的两边通常是对应的,
因为ring用过去时rang,所以happen也用过去时happened
答
happened to he
这里的be 和后面out 构成“在外面”的意思
happen to do 是“恰好在做某事”的意思
答
happened to he