单项选择题

We all think that the new device he has proposed is ingenious.

A. effective
B. clever
C. implausible
D. original
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单项选择题
In his two-hour-long lecture he made an exhaustive analysis of the issue.
A. extremely thorough B long and boring
C. superficial
D. unconvincing
单项选择题
The new job will provide you with invaluable experience.
A. simply useless
B. really practical
C. very little
D. extremely useful
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