What he emphasized over and over again was that ___________（不管多么困难) they should n
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What he emphasized over and over again was that, ___________(不管多么困难), they should never retreat even for an inch.
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正确答案：no matter how difficult it might be
no matter how difficult it might be 解析：本题考查让步状语从句的表达not matter how (不管多么)；另外，从后面主句中 should never retreat可知从句也应用虚拟语气，而全句的主句用了过去时，所以这里用might be。