问题
单项选择题
The plant products have been carefully inspected and are considered to be （）from any quarantine pests.
A．out
B．away
C．free
D．far
答案
参考答案：C
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The plant products have been carefully inspected and are considered to be （）from any quarantine pests.
A．out
B．away
C．free
D．far
参考答案：C