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A．prove
B．proves
C．have been proved
D．are proved
答案
更多“Economics, several courses of which I have taken thus far, ______ to be difficult but usef”相关的问题
第3题
A.Workers in the new economy must be more computer literate than they were in the past
B.If the food stamp program is eliminated, the poor will have difficulty feeding their families
C.The elimination of tariffs on imported goods and services has increased unemployment in the United States
D.All of the statements above represent examples of positive economics
E.None of the statements above represent examples of positive economics
第4题
80/20 法则背后的经济学原理是范围经济(economics of scale)，指随着某种生产数量规模的扩大，长期平均成本会下降。()
第5题
A.Markets
B.Money
C.Profit seeking
D.The price mechanism
E.Scarcity
第6题
A.recover
B.appreciate
C.exaggerate
D.address
第8题
A.were joined
B.were participated
C.were included
D.were involved
第9题
A.Discontinuous chip
B.Discontinuous chip with BUE
C.Continuous chip
D.Continuous chip with BUE
第10题
I saw______boys at the park.
A．the both
B．many a
C．both the
D．the several
