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——疑问!!!!——
Some anthropologists believe that the genetic homogeneity evident in the world’s people is the result of a"population bottleneck" -- at some time in the past our ancestorssuffered an event, greatly reducing their numbers and thus our geneticvariation.
A at some time in the past ourancestors suffered an event, greatly reducing their numbers
B that at some time in the past our ancestors suffered an event thatgreatly reduced their numbers
C that some time in the past our ancestors suffered an event so thattheir numbers were greatly reduced,
D some time in the past our ancestors suffered an event from whichtheir numbers were greatly reduced
E some time in the past, that our ancestors suffered an event so as toreduce their numbers greatly,
OA: B
OG解释说这里必须有that,不然后面的句子会unclear,....实在是不明白怎么个unclear,为啥子一定要有that呢? |
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