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父母去年十二月过来的，本来打算呆一年，三月份file了I-539 ，准备延半年，现在状
态还是pending，现在家里有急事要回去，因此不打算延了，可以要求撤回申请吗。
-Not need to withdraw it.

还有如果延签批了，年底还能用这个签证回来吗。
-Yes no matter whether the I-539 is approved or denied. Bring the I-539 ling receipt with them when they reenter US, just in case.