A-A+
Two months ago we were very bearish but_____
问题详情
Two months ago, we were very bearish, but_______then we have switched our strategy to the bullish side.
A．yet
B．still
C．already
D．since
参考答案
正确答案：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。
