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.
答
他说不能去话，就说明他现在正在有事嘛，所以我们就会考虑用进行时，填is looking
答
Tom can't go with us because he is looking（look)after his mother at home.
look after照顾
答
is looking
答
is looking
希望对你有帮助
答
is looking
Tom不能和我们一起去了，因为他要在家照顾他妈妈。
其实这也可以用must look的，这种题目一般要根据语句来填的。
答
is looking
当你知识积累很多，
must look也是可以的，不过，此阶段不适合你
答
is looking
答
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
答
is looking 意思是他不能跟我们去因为他正在家照顾她妈妈