Bob isn't good at math,but he tries ____________ hard求解此空是填working还是to work.

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Bobisn''tgoodatmath,buthetries____________hard求解此空是填working还是towork.Bobisn''tgoodatmath,buthetries____

Bob isn't good at math,but he tries ____________ hard求解此空是填working还是to work.
Bob isn't good at math,but he tries ____________ hard
求解此空是填working还是to work.

Bob isn't good at math,but he tries ____________ hard求解此空是填working还是to work.
填 to work.这是表示目的,try to work hard 努力学习.
try sth是尝试.比如try this shirt试试这件衬衫