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题库 / BiChu21-SC-710
Researchers have chronicled changes in monsoon intensity that have occurred over tens of thousands of years, with few of them that have examined variations in intensity over the smaller time scales relevant to human civilization.
with few of them that have examined variations in intensity over
with few of them being examined variations in intensity for
but few have examined variations in intensity for
but few having examined the variations in intensity over
although few had examined variations in intensity over
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根据句意，指的是研究人员做了一些事，但是很少有人做另外一件事。时态要一致，直接排除5。4用but连接却无动词，排除。2如果正确，few of them指代changes，它说的是同一件事，不能伴随。1是原文，that是不对的。
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