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
为啥选A呢?? 谢谢谢谢大家,告诉告诉俺吧(搜过历史贴)
老OG题...后置twice:
American productivity is declining in relation to Europe’s; the energy
expended per unit of production in the United States is as much as twice
that expended in West Germany.
A team from the National Transportation Safety Board was dispatched to
investigate the incident, though it was expected to be days and perhaps
weeks before a clear picture of the cause would emerge.
不可能是picture和causes並列做主語, 如果是, 那要用have不是用has
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