问题补充：
Did you see Xiao Li at the party? No, by the time I arrived.
A. she had left
B. she has left
C. she was left
D. she must left
答案：
(答案→)A. she had left
B. she has left
C. she was left
D. she must left
解析：可联系答.案.网客服索取。
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