帮我填空:1.They are _ working now.

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帮我填空:1.They are _ working now.
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帮我填空:1.They are _ working now.
帮我填空:1.They are _ working now.

帮我填空:1.They are _ working now.
如果是两个人就用both,三个及以上用all

both

busy
be busy doing 忙于做某事

all

可以用：busy 因为;be busy doing 忙于做某事
另外：两者用both 三者含以上用：all
记着采纳哟！

busy (be busy doing 忙于做某事）

all ，both，busy

句子本身就是个完整句子。所以all ,both,busy 等任何逻辑上说的过去的副词都可以加上去。

busy 把 be busy (in) doing sth
其实8楼所得没错。这个句子的答案太多了。有好多副词都可以填进去的的。但是busy还是保险些。像both,all等还要区分是两者还是两者以上的。不大好

主谓宾全齐.可以随便填什么....

not