1. Fallen rocks are impeding the progress of rescue workers.
(A) constructing
(B) destructing
(C) imposing
(D) obstructing
(E) proposing
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統計: A(2), B(13), C(4), D(72), E(1) #2277023
統計: A(2), B(13), C(4), D(72), E(1) #2277023