______was the beginning of American involvement in Vietnam.
A、Japanese surrender in 1945
B、The outbreak of the Korean War
C、The French invasion of Indochina
D、Truman’s decision to send military aid to Vietnam to support the French
【正确答案】：D
【题目解析】：朝鲜战争爆发后，杜鲁门决定向越南运送军事援助支持法国与越盟作战，这是美国卷入越战的开始。
