--------(if,but,because)necessary ,i will come to help you.

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--------(if,but,because)necessary ,i will come to help you.
--------(if,but,because)necessary ,i will come to help you.

--------(if,but,because)necessary ,i will come to help you.
If
If necessary 是 If it is necessary的省略,意为:“如果有必要的话”
句意:如果有必要的话,