问题描述：
it took him (four hours) to go to beijing by train yesterday.对括号部分提问
＿＿ ＿＿ ＿＿ it ＿＿ him to go to beijing by train yesterday
＿＿ ＿＿ ＿＿ it ＿＿ him to go to beijing by train yesterday
问题解答：
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