单项选择题

Rubber differs from plastics______it is produced naturally.

A．at that
B．in that
C．for that
D．with that
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单项选择题
The doctor will not perform the operation______it is absolutely necessary.
A．so
B．if
C．for
D．unless
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
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