During the rush hours, a policeman directs traffic at the intersection, and _________ there have been no accidents.

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问题 During the rush hours, a policeman directs traffic at the intersection, and _________ there have been no accidents.

选项 A、as of now
B、to the present
C、up until currently
D、so far

答案D

解析 副词短语可用来表示时间、地点、程度等概念。so far常用于完成时态。因此D为正确选项。
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