改错：the boy who saw him just now won a prize in the sports meeting last month
问题描述：
改错：the boy who saw him just now won a prize in the sports meeting last month
答
The boy who saw him just now had won a prize in the sports meeting last month .看见他的时间是刚才,而获奖时间是上个月.刚才已经是过去,而获奖是在看见他的过去发生的,所以“last month”是“过去的过去”,符合...