单项选择题

Going out for a holiday is a good way to relax and refresh yourself, and this is especially true______ it comes to preventing depression.

A．since
B．before
C．after
D．when
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单项选择题
As we all know, thick forests are the natural ______for birds, animals and insects, and we must forbid cutting trees without any limitation.
A．habitat
B．resort
C．residence
D．refuge
单项选择题
He'd never have done such a thing if he had been ______at that crucial moment.
A．in his right mind
B．in two minds
C．of one mind
D．on his mind
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