单项选择题
The reasoning in this editorial is so that we cannot see how anyone can be deceived by it.
A．coherent
B．special
C．cogent
D．specious
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单项选择题
He worked ______ at his task for weeks before he felt satisfied that the results would justify his long effort.
A．occasionally
B．regularly
C．patiently
D．assiduously
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单项选择题
After several ______ attempts to send the missile into space, the spacecraft was finally launched successfully.
A．abortive
B．difficult
C．experimental
D．preliminary
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