第一道题有省略,实际上是：he did what he could do to help me with my math.这里动词不定式表目的：为了在数学方面帮助我.如果去掉to这道题就多了谓语而错了.
第二道题,原意是：他不知那个男孩那时在做什么.A中has 应改成had就对了.
不知道你明白了没有.
英语好的进he did _______ could _______ me with my mathA.what;to h
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