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This experiment ought to ______ lastweek.
A.be done
B.have been done
C.have done
D.do
B.have been done
C.have done
D.do
参考答案
参考解析
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。
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