UNit 3 Under the sea.

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1.How many books can I borrow? One ______ A.at one time B.at times C.at a time D.at the time one 和a 有什么区别．？

解题思路： at one time过去，曾经。 at a time 每次；一次。 at times有时,间或; at the time在那时
解题过程：
此题正确答案是C。
at one time过去，曾经。例如：At one time they met frequently.一度他们经常见面。
at a time 每次；一次。例如：Take three pills at a time.每次服三粒。
at times有时,间或; 例如：Everyone may make mistakes at times.每个人不时都会犯错误。
at the time在那时 He was very poor at the time.他那时候很穷。
因此根据题意选C正确。
最终答案：略

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