how often___checked?1 have they it 2 they have it 3 do they have it 4 they do have it请问选择哪一个,及分别说出每个为什么对与错,
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howoften___checked?1havetheyit2theyhaveit3dotheyhaveit4theydohaveit请问选择哪一个,及分别说出每个为什么对与错,howoften___
how often___checked?1 have they it 2 they have it 3 do they have it 4 they do have it请问选择哪一个,及分别说出每个为什么对与错,
how often___checked?1 have they it 2 they have it 3 do they have it 4 they do have it
请问选择哪一个,及分别说出每个为什么对与错,
how often___checked?1 have they it 2 they have it 3 do they have it 4 they do have it请问选择哪一个,及分别说出每个为什么对与错,
3
have sth done 请某人做什么.其它选项与此结构不符
“他们多久请人检查一次?”
请及时采纳,不懂继续问( 天天在线 ）
选3 do是助动词表示疑问，后面是have sth done的用法