单项选择题

The experiment is not satisfactory and its data is doubtful; we'll have to do it ______ time.

A．second
B．the second
C．a second
D．this second
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单项选择题
Peter ______ the driver's test, but he was not calm enough in the last minutes.
A．can have passed
B．might have passed
C．ought to have passed
D．must have passed
单项选择题
Although it is the first time he takes up such a big task, never ______ afraid of difficulties.
A．he has been
B．has been he
C．has he been
D．been has he
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