If you are not familiar______the operation of this machine, please ask our assis

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问题 If you are not familiar______the operation of this machine, please ask our assistant for help.

选项 A、for
B、on
C、in
D、with

答案 D

解析本题考查固定短语的用法。分析句子可知，空格前面是形容词familiar，后面是名词短语。familiar常用于be familiar with…结构，意为“熟悉……”，由此确定本题答案为D)。

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