2. 专升本
  3. Take your vaccination certificate with you ______ they ask for it at the airport.

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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