How I regretted ______ the hours in the forest ______ I should have studied hard in the classroom.
A.to waste; when
B.to waste; where
C.wasting; when
D.wasting; where
网友回答
C解析考查regret的用法，句型regret doing sth意思“后悔做某事”，后面的句型should have done sth意思“本应该做什么事情而没做”，根据意思，可知选C