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题目内容
（聊城大学-大学英语四(专升本)）
(单选题) We are puzzled __________ how it happened.(本题3.0分)
A、 as usual
B、 as yet
C、 as well
D、 as to
A、 as usual
B、 as yet
C、 as well
D、 as to
参考答案
