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