阿摩線上測驗
3. Long before humans launched the first artificial satellites into space, the Russian
scientists will have presented the possibilities of space colonization.
(A)Long
(B) launched
(C)satellites
(D) will have presented
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統計： A(1), B(2), C(0), D(11), E(0) #2717522
統計： A(1), B(2), C(0), D(11), E(0) #2717522
