单项选择题

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 help
D. not be able to help

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单项选择题

A.giving
B.receiving
C.accepting
D.learning

问答题

When Chekhov entered the Moscow University Medical School in 1879, he started to publish hundreds of comic short stories to support his family.