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关于新概念3 42课 After ____the narrow gap,they climbed down the st

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关于新概念3 42课
After ____the narrow gap,they climbed down the steep sides of the cave.
这里为什么用“entering”不用entered.
let _____the current to the other side.
这里为什么用“themselves be carried by”?
No other sound could be heard ____made by water...
这里为什么用“than that”?
-or the chance that they____an unexpected discovery that.
这里为什么用may make 不用would make.
关于新概念3 42课 After ____the narrow gap,they climbed down the st
/>这里的after为介词,后面跟动名词短语.

课文原句是let the current carry them to the other side.
填空将其转为被动语态就是let themselves be carried by

原句是the only sound that could be heard was made by water...
No other ...than句型中than表示除了,意为“其它声音都听不到,只听到……”
that是指代sound

   4. Perhaps it is the desire for solitude or the chance of making an unexpected discovery that lures people down to the depths of the earth.
       这里讲的通常吸引人们去地下深处探险的原因.讲的是一般性的状况用may表推测即可.would表推测可能性过大,而事实上并非下去探险就很有可能有unexpected discovery的.