16.
(A) we cannot really call it a neighbor
(B) we do not know anything about it yet
(C) we might not be able to stay there for long
(D) we are not sure how long it takes to get there
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統計: A(278), B(82), C(68), D(89), E(0) #815726
統計: A(278), B(82), C(68), D(89), E(0) #815726