It will be a long time       we reach the little town.
A．thatB．untilC．sinceD．before
D
考查固定句型。It will be +一段時(shí)間+before…，表示多久之后才能…….所以選D。意為：要過(guò)很久我們才能到達(dá)那個(gè)小鎮(zhèn)。
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