问题
选择题
Susan and Lily______tomatoes a nd other vegetables on the farm this time yesterday.
A．pick
B．are picking
C．will pick
D．were picking
答案
答案：D
题目分析：根据时间状语this time yesterday可知本句描述的是过去某时正在进行的动作，故用过去进行时态，选D。
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