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His telephone number is 8013308.Did you _______?

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His telephone number is 8013308.Did you _______?
A、write it down
B、write down it
我知道答案是A,但为什么不能选B呢?
His telephone number is 8013308.Did you _______?
这是固定用法,这些东西有时无法解释,你只要记住,动词加介词,如果后面再接,如果是代词就必须放在中间,其他名词随便你放在后面还是中间