Two months ago, we were very bearish, but_______then we have switched our strategy to the bullish side.

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问题 Two months ago, we were very bearish, but_______then we have switched our strategy to the bullish side.

选项 A、yet
B、still
C、already
D、since

答案D

解析这里的then是名词，它的前面应该填入介词。选项中只有D选项是介词，其他选项都是副词。

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