单选题 The senator of New York courted black voters, considered crucial to ______ the Democratic presidential nomination, in a series of campaign stops.
A. confining B. securing C. tampering D. pervading

【正确答案】 B
【答案解析】[解析] confine“限制”；secure“保护，获得”；tamper“干预，贿赂，削弱，篡改”；pervade “遍及”。