英语at onceNobody can do two things well -----A.at onceB.at one time答案是A 但是词典中有下列句子Don't talk at one time ,please talk one by one.也翻译为同时 请解释为何不选B

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英语at onceNobody can do two things well -----A.at onceB.at one time答案是A  但是词典中有下列句子Don't talk at one time ,please talk one by one.也翻译为同时 请解释为何不选B

英语at onceNobody can do two things well -----A.at onceB.at one time答案是A 但是词典中有下列句子Don't talk at one time ,please talk one by one.也翻译为同时 请解释为何不选B
英语at once
Nobody can do two things well -----A.at onceB.at one time答案是A  但是词典中有下列句子Don't talk at one time ,please talk one by one.也翻译为同时 请解释为何不选B

英语at onceNobody can do two things well -----A.at onceB.at one time答案是A 但是词典中有下列句子Don't talk at one time ,please talk one by one.也翻译为同时 请解释为何不选B
at once 这里指一次 ,这里是一次不能做两件事情.
at one time 指同时