两道英语介词填空1.The terrible traffic accident will serve ______ a lesson for those careless drivers.2.Here is a chance ______ everyone to learn new skills.请简要说明原因

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两道英语介词填空
1.The terrible traffic accident will serve ______ a lesson for those careless drivers.
2.Here is a chance ______ everyone to learn new skills.
请简要说明原因

1,serve 做vt,可以不加介词,
如果做vi使用,可以加up,表示“提出,提供”
2,for ,为每个人提供的机会

第一个不用填介词
第二个填For