Check your answers carefully and make some changes______.

Check your answers carefully and make some changes______.
A if it necccessary B if you are necccessary C if is necccessary D if necccessary
请分析句式,

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娃哈哈5n146 幼苗

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选D
应是if it is necessary“如果必要”,it is可省略.
necessary 一般不用人作主语.

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佛缘神父幼苗

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D if it is necessary 要省略必须it is一起省略

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