be not able to do sth be unable to do sth区别They failed to pass the exam last time,I regretted ___.A.being unable to helpB.being not able to help

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be not able to do sth be unable to do sth区别They failed to pass the exam last time,I regretted ___.A.being unable to helpB.being not able to help

be not able to do sth be unable to do sth区别They failed to pass the exam last time,I regretted ___.A.being unable to helpB.being not able to help
be not able to do sth be unable to do sth区别
They failed to pass the exam last time,I regretted ___.
A.being unable to help
B.being not able to help

be not able to do sth be unable to do sth区别They failed to pass the exam last time,I regretted ___.A.being unable to helpB.being not able to help
选A
选B的话应该是
I regretted not being able to help
not的位置错了