问题
选择题
---What were you doing when the UFO ______?
---I ______ a milk shake.
A．reached, made
B．reached, was making
C．arrived, made
D．arrived, was making
答案
答案：D
考查词汇和时态。句意：----当不明飞行物到达的时候，你在做什么？---我正在制作一杯奶昔。故选D。
