单项选择题

Since there is no ______ , why don't we work on it now

A．option
B．duty
C．obligation
D．penalty
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单项选择题
This idea is ______ , it can not stand any test.
A．vulnerable
B．subjective
C．subordinate
D．liable
单项选择题
Working only 8 hours a day is ______ to finish such a big project.
A．inadequate
B．incapable
C．incompatible
D．invalid
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