单项选择题

Bill looked rather _______ when the professor asked him a question which he didn't know how to answer.

A．embarrassed
B．cordial
C．indignant
D．humble
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单项选择题
The representatives were asked to _______ their earlier statements.
A．verify
B．certify
C．testify
D．terrify
单项选择题
There was another innovation in 1941, unique because it was _______ by the labor union of the dress industry,
A．conceived
B．conserved
C．deserved
D．preserved
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