现在进行时：
sb.is doing sth.
sb.are doing sth.
而且又是复数,所以必须用 are.
[ ]Tina and Julia working hard at their lessons
[ ]Tina and Julia working hard at their lessons
a.Is b.Do c.Can d.Are
[ ]里面应该填哪一个
为什么
为什么不能用do呢
a.Is b.Do c.Can d.Are
[ ]里面应该填哪一个
为什么
为什么不能用do呢
英语人气：300 ℃时间：2020-06-04 09:03:10
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