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This experiment ought to ______ lastweek.A.be done B.have been d...

作者: tihaiku 人气: - 评论: 0
问题 This experiment ought to ______ lastweek.
选项 A.be done B.have been done C.have done D.do
答案 B
解析 考查ought to的用法。根据时间状语lastweek可知，此处是在谈论过去的情况。“ought to+have+过去分词”表示过去应做某事而实际未做。此处应该是实验“被做”，所以用have been done。句意为“这个实验本应在上周做(实际上未做)”。“ought to+动词原形”用于谈论现在或将来的情况。

相关内容：experiment,lastweek.A.be,B.have

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