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We need to _____ how we are going to get there.
A．work onB．work upC．work outD．work at
C
考查短語(yǔ)辨析。work on 從事，work up 刺激，激起，work out 解決，計(jì)算出，work at在什么上班，從事，句意：我們必須計(jì)劃好怎樣到那。所以選C。
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