They failed to pass the exam last time, I regretted _______________.
A.to be not able to help B.being unable to help C.being not able to helping D.not be able to help正确答案B
They failed to pass the exam last time, I regretted _______________.
A.to be not able to help B.being unable to help C.being not able to helping D.not be able to help正确答案B