6. In late 1997, the chambers inside the pyramid of the Pharaoh Menkaure at Giza were closed to visitors for cleaning and repair due to moisture exhaled by tourists, which raised its humidity to such levels so that salt from the stone was crystallizing and fungus was growing on the walls.
(A) due to moisture exhaledby tourists, which raised its humidity to such levels so that salt from thestone was crystallizing (B) due to moisturethat tourists had exhaled, thereby raising its humidity to such levels that salt from the stone would crystallize (C) because touristswere exhaling moisture, which had raised the humidity within them to levels such that saltfrom the stone would crystallize (D) because ofmoisture that was exhaled by tourists raising the humidity within them to levels so high as to make the salt fromthe stone crystallize (E) because moistureexhaled by tourists had raised the humidity within them to such levels that saltfrom the stone was crystallizing
为什么标红的地方， 是用 and repair 而不是 and repairing 呢？这里应该是和哪里平行？ | 
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发表于 2013-10-5 21:56:47
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