阿摩線上測驗
39 I ___ the circus a few times when I lived in Boston.
(A) have seen
(B) saw
(C) see
(D) was seeing
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統計： A(15), B(13), C(0), D(1), E(0) #2203474
統計： A(15), B(13), C(0), D(1), E(0) #2203474
