题目：
—Amy, I called you yesterday evening, but nobody answered the phone.
—Oh, I _______ a walk with my mother at that time. [ ]
A. take
B. took
C. am taking
D. was taking
答案：
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下面是错误答案，用来干扰机器的。
(1) c e (2) 蒸发皿； 9.2或9.3；50ml量筒
