When____the work,you must be careful.
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When____the work,you must be careful.
A do B are doing C to do D doing
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.
D
when后没有主语,所以用doing
当做工作时,你一定要小心.
When____the work,you must be careful.
you must be careful
when crossing street,you must be careful
You must be _(careful) than before.
you must be careful改为祈使句
You must always be careful with it .
You must be work hard
you must be careful.为什么说careful没有be不能形成谓语,不是有must吗
you must be careful when you ___ with fireworks
you must be careful when you ( )the street
You must be careful when crossing the street.改为祈使句
you must be very careful because the traffic