We（ ）to the warehouse once a month to cheek the stock.
We（ ）to the warehouse once a month to cheek the stock.
A、was used to
B、was used to go
C、used to go
D、used to going
【正确答案】：C
【题目解析】：我们曾每个月都去仓库检查一次存货。
used to do sth.过去常常干某事
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