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 economical
答案为E, 为何用 would have 和 economical (而不是economic)?
The distinctive hereditary tartans that are alleged to be worn
since antiquity by members of the Highland clans were in fact designed
by Scottish woolen manufacturers in the eighteenth and nineteenth
centuries.
(A) that are alleged to be worn
(B) alleged to have been worn
(C) that are worn, it was alleged
(D) alleged as having been worn
(E) that are worn, allegedly
