James has put on so much weight recently that his mother has to all his trousers to his m

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A. bring in
B. give away　
(答案→)C. let out
D. make up
解析：此处bring in 引进； give away分发； let out将衣服的尺寸放大、放宽或放长； make up编造，化妆。句意：James最近体重增加很多以至于他的妈妈不得不把他的裤子依照他的尺寸放宽。根据句意选C。