答案：C
find out 表示“弄清楚,查明”,是指经过努力,研究之后发现了.
he tried hard but couldn't____the reason why she kept silence at the meeting
he tried hard but couldn't____the reason why she kept silence at the meeting
Alook for Bfind Cfind out Dlook after
Alook for Bfind Cfind out Dlook after
英语人气：550 ℃时间：2020-02-04 06:24:21
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