13. The observers advise that the government _______ a lot into the educating of illiterate voters.
(A) invests
(B) would invest
(C) invest
(D) investing
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統計: A(66), B(38), C(159), D(35), E(0) #2351301
統計: A(66), B(38), C(159), D(35), E(0) #2351301