They spent a lot of time ___ (go ) back.They had bikes and they ___(feel)convenient.
问题描述：
They spent a lot of time ___ (go ) back.They had bikes and they ___(feel)convenient.
答
They spent a lot of time (on going) back. They had bikes and they (felt) convenient.
答
（on) going
felt
答
going felt
答
to go
felt
答
going
felt
答
They spent a lot of time going___ (go ) back. They had bikes and they _felt__(feel)convenient
请采纳!!!!!!!!!
答
spent time （in）doing sth
根据此句型,填going（括号内是可以省略的）
后一空根据had可以判断是一般过去时,填felt
答
going(spend. doing)
felt(and左右时态一致)