Tom can't go with us because he_________(look)after his mother at home.

问题描述:

Tom can't go with us because he_________(look)after his mother at home.

is looking
其实我觉得will be looking 也讲得通 因为它没有说是什么时间go with us 啊 前面没有具体表示时间的词或时态 但可能这个初中阶段还没学到将来进行时吧 还是is looking 好些