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Someone called me up in the middle of the night, but he hung up I could answer t

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Someone called me up in the middle of the night, but he hung up I could answer t

Someonecalled me up in the middle of the night, but he hung up ________________ Icould answer the phone.

A.as    B.since    C.until    D.before

 

试题答案

答案:D

提示:
“在我接电话之前就挂了”