When____the work,you must be careful.A do B are doing C to do D doing
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When____the work,you must be careful.A do B are doing C to do D doing
When____the work,you must be careful.
A do B are doing C to do D doing
When____the work,you must be careful.A do B are doing C to do D doing
你好,很高兴能够在这里回答你的问题,这道题的正确答案应该为:
D
when后没有主语,所以用doing
当做工作时,你一定要小心.
答案:D doing
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finish当你完成作业时,你必须要小心