26. Linda will take a trip to Europe this summer. She wants to visit many places, so she needs to study the subway system in Europe. Which unit is the most useful for her?
(A) Unit Two.
(B) Unit Tree.
(C) Unit Four.
(D)Unit Five.
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統計: A(6), B(8), C(78), D(2), E(0) #2353291
統計: A(6), B(8), C(78), D(2), E(0) #2353291