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To develop more accurate population forecasts,
demographers have to know a great deal more than
now about the social and economic determinants of
fertility.
(A) have to know a great deal more than now about
the social and economic
(B) have to know a great deal more than they do
now about the social and economical
(C) would have to know a great deal more than they
do now about the social and economical
(D) would have to know a great deal more than they
do now about the social and economic
(E) would have to know a great deal more than now
about the social and economic
直接have to就行了吧·· |
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发表于 2012-7-23 16:53:58
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发表于 2012-7-23 18:33:10
