采用函询的方式咨询专家们的建议以做出决策的方法是（ ）
A．头脑风暴法
B．德尔菲法
C．模拟决策法
D．方案前提分析法
参考答案：B
—Did you see Tom at the party?
—No, he_________by the time I got there.[ ]
A. left
B. was leaving
C. had left
D. has left
Over the weekend, my friend asked me for help. Her temperature was 39.7C and she was ______ a fever.
A．catching
B．running
C．had
D．led
