单项选择题

We need help with the fourth problem; it （） us.

A．persists
B．permeates
C．perplexes
D．perturbs

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单项选择题

The meaning of this poem is very （）; I really don't understand it.

A．shady
B．dim
C．illegible
D．obscure

单项选择题

Man in general does not appreciate what he has （） he loses it.

A．after
B．until
C．before
D．when

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