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 helping
D．not be able to help
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单项选择题
I hope you will never fall into that _______.
A．mistake
B．fault
C．error
D．defect
单项选择题
The scientific group is carrying out a research focused on a drug which is so _______ as to be able to change brain chemistry.
A．powerful
B．influential
C．monstrous
D．vigorous
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