问题描述：
Susan:Where are you going ,David?
David:To Beijing?
Susan:It’s a long trip from here by bike.How long will it take you to (51)c_________it?
David:About two years.
David:To Beijing?
Susan:It’s a long trip from here by bike.How long will it take you to (51)c_________it?
David:About two years.
问题解答：
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