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
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