18、Don’t worry too much about __ mistake. They are ___natural part of learning.

A．不填;a  B．the; 不填    C.the;the       D.the;an

18、A

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Don’t worry too much about __ mistake. They are ___natural part of learning.

A．不填;a  B．the; 不填    C.the;the       D.the;an

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