阿摩線上測驗
19. The boy is shy and conservative _______ his younger brother is outgoing and active.
(A) unless
(B) because
(C) as
(D) while
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統計： A(14), B(10), C(7), D(41), E(0) #1908554
統計： A(14), B(10), C(7), D(41), E(0) #1908554
