单项选择题

There is no point________ in the dangerous place if you can't do anything________ the people who have to stay there.

A．remaining...helping
B．to remain...to help
C．in remaining...to help
D．in remaining ... helping
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单项选择题
Someone is at the door . ________
A．What is it
B．Who is it
C．Who is he
D．Which one is it
单项选择题
The shutdown of the machine was due to its________ parts.
A．decayed
B．detective
C．deficient
D．spoiled
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