we didi research on the same problem,so we usually help each other
同义句转换
my work _______ ________ with his research,so we usually helped each other.
句子中第二个单词应该是did，不好意思，不小心多打了个i，虽然不影响。
我又在书上找了找，认为最好的答案是'was connected',
由于3楼的回答最接近，就取3楼为最佳答案了，我们一起加油吧！