单项选择题

Rubber differs from plastics_________ it is produced naturally and not in file.

A．at that
B．in that
C．for that
D．with that
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单项选择题
The river here is very wide but_________, so you can walk across it.
A．narrow
B．arrow
C．shallow
D．hollow
单项选择题
The doctor’’s advice was that the patient_________ at once.
A．to be operated
B．being operated
C．be operated
D．operated
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