问题补充：
—I went to Qianfo Hill . And it was really crowded.
—So did I .
A. last weekend
B. next Sunday
C. since last week
D. for a week
答案：
(答案→)A. last weekend
B. next Sunday
C. since last week
D. for a week
解析：last weekend上周末；next Sunday下周日；since last week自从上周以来；for a week已经一周了。结合语境可知上文描述的是过去发生的动作，故时间状语应该表示过去的时间，选A。
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