to keep up with his school work for the months when he s_____ in _英语解答

to keep up with his school work for the months when he s_____ in hospital.

人气：280 ℃　时间：2020-03-22 02:27:04

解答

1.要看 to 前面句子主干是什么时态
2.如没有限定横线上所填词的范围,可选用如下：
现在时 stays
过去时 stayed