Last year the well-known actress did she help the poor children in the mountain village

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(答案→)A. what; could to
B. everything; could
C. all; could
D. that; could to
解析：第一空考查宾语从句，what引导宾语从句，在宾语从句里what做宾语，宾语从句的谓语could do，do被省略了，第二空填 to，to help做目的状语，句意是：去年，著名的女演员尽自己最大的努力帮助山区的穷孩子。选A。