GWD17-Q32:
Navigators have known for thousands of years that the ocean has variable currents, but it is only in the last half century that a reasonably clear picture has emerged of the patterns and causes of ocean currents.
A. a reasonably clear picture has emerged of the patterns and causes of ocean currents
B. a reasonably clear picture of the patterns of ocean currents and their causes have emerged
C. a reasonably clear picture emerged of ocean currents, their patterns and the causes of them
D. there have emerged a reasonably clear picture of the patterns of ocean currents and what caused them
E. there had emerged a reasonably clear picture of the patterns of ocean currents and their causes作者: augest 时间: 2010-12-1 20:00
A还原一下就清楚多了。-> a reasonably clear picture of the patterns and causes of ocean currents has emerged作者: Nickyl90 时间: 2010-12-2 06:43
LZ..自问自答? a reasonably clear picture of the patterns and causes of ocean currents has emerged
不能是这两个并列吗作者: parispings 时间: 2010-12-2 21:05