Take your vaccination certificate with y

资格题库2022-08-02 31

问题 Take your vaccination certificate with you ____they ask for it at the airport.（　　）A． unless B． in case C． when D． because of

选项 A． unless
B． in case
C． when
D． because of

答案 B

解析选项C不符合题意，选项D后应接短语。in case意为“以防万一”，故选B。

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