69. Demographers investigate _____ in specific locations.
(A) are there many people
(B) how many people are there
(C) how many people there are
(D) that there are how many people
答案:登入後查看
統計: A(57), B(410), C(517), D(217), E(0) #2369127
統計: A(57), B(410), C(517), D(217), E(0) #2369127