问题
单项选择题
（） over a week ago, the books are expected to arrive any time now.
A. Ordering
B. To order
C. Having ordered
D. Ordered
答案
参考答案：D
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（） over a week ago, the books are expected to arrive any time now.
A. Ordering
B. To order
C. Having ordered
D. Ordered
参考答案：D