阿摩線上測驗
42. Our exploration of the space has dual purposes, one of _______ is to get energy and resources and the other of which is to migrate people if necessary.
(A) which
(B) where
(C) what
(D) whom
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統計： A(3), B(0), C(0), D(0), E(0) #3257584
統計： A(3), B(0), C(0), D(0), E(0) #3257584
