单项选择题

When a psychologist does a general experiment about the human mind, he selects people ______ and asks them questions.

A．at random
B．at will
C．at length
D．in essence
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单项选择题
Only under special circumstances ______ to take make-up tests.
A．freshman are permitted
B．are freshman permitted
C．permitted are freshman
D．are permitted freshman
单项选择题
I am determined to get a ticket for the football games ______ it means standing in a queue all night.
A．provided
B．as if
C．even if
D．whatever
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