单项选择题

_____you’’ re early you can’’t be sure of getting a seat.

A．If
B．Unless
C．When
D．Because
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单项选择题
Evidence came up_________ specific speech sounds are recognized by babies as young as 6 months old.
A．where
B．that
C．which
D．what
单项选择题
When climbing the hill, John was knocked unconscious by an______ rolling stone.
A．untouched
B．unfamiliar
C．unexpected
D．unbelievable
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