Take your vaccination certificate with you ______ they ask for it at the airport.

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问题 Take your vaccination certificate with you ______ they ask for it at the airport.

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,所以选项B是正确的。
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