阿摩線上測驗
12 As Americans age and population growth slows,___________ has emerged as the key social force to move
the nation towards its new future by providing labor power and populous citizenry.
(A) immigration
(B) administration
(C) investment
(D) authority
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統計： A(56), B(10), C(3), D(7), E(0) #2099402
統計： A(56), B(10), C(3), D(7), E(0) #2099402
