单选题
Prior to
his appointment as foreign minister, Mr. Li was the vice minister of foreign affairs.
A、
After
B、
Before
C、
During
D、
Previous
【正确答案】
B
【答案解析】
after在……之后；before在……之前：during在……期间：previous以前的。因为 prior to意为“(时间上)较前的，较早的”，故选B项。
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