问题
选择题
________ people go abroad, they have to bring their passports with them.
A．Until
B．When
C．Because
D．Before
答案
答案：B
题目分析：句意：当人们出国时，他们不得不带着他们的护照。A. Until直到B. When当C. Because因为D. Before在……之前，根据句意，故选B。
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